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Videos uploaded by user “Brian McLogan”
Finding the inverse of a function
 
03:27
Learn how to find the inverse of a linear function. A linear function is a function whose highest exponent in the variable(s) is 1. The inverse of a function is a function which reverses the "effect" of the original function. One important property of the inverse of a function is that when the inverse of a function is made the argument (input) of a function, the result is x. Given a function, say f(x), to find the inverse of the function, we first change f(x) to y. Next, we change all x to y and y to x. and then we solve for y. The obtained solution for y is the inverse of the original function. #functions #inverseoffunctions Series Playlist https://www.youtube.com/playlist?list=PL0G-Nd0V5ZMqYo1t0Vlxd9wGfNsoRgPPg
Views: 421143 Brian McLogan
Find the reference angle and sketch both angles in standard position
 
03:25
http://www.freemathvideos.com In this video series I show you how to find the reference angle of a given angel. The reference angle is the acute angle between the terminal and the horizontal axis. For each quadrant there are different formulas we will explore to find the reference angle. θ = -145 degrees
Views: 38578 Brian McLogan
How to find the slope between two points
 
03:13
Learn how to find the slope between two points. The slope of a line is the steepness of the line. The horizontal line has a zero slope while the vertical line has an undefined slope. To determine the slope of a line passing through two points, we need to know the coordinates of 2 points on the line. Then the slope of the line is given by the quotient of the difference between the y-coordinates and the difference between the x-coordinates. i.e. slope = (y2 - y1) / (x2 - x1). #linearequations #sloperateofchange
Views: 346345 Brian McLogan
How to find the center and radius of a circle in standard form
 
05:06
Learn how to graph the equation of a circle by completing the square. Completing the square will allow us to transform the equation of a circle from general form to standard form. When the equation is in standard form we can identify the center and radius of the circle to graph to then graph the circle. #conicsections #circleconicsections
Views: 210229 Brian McLogan
How to use Descartes rule of signs to determine the number of positive and negative zeros
 
04:20
Learn about Descartes' Rule of Signs. Descartes' rule of sign is used to determine the number of positive and negative real zeros of a polynomial function. Knowing the number of positive and negative real zeros enables also to also know the number of complex zeros of a complex number. Descartes' rule of signs states that the number of positive real zeroes in a polynomial function f(x) is the same or less than by an even number as the number of changes in the sign of the coefficients of the terms of the polynomial function. The number of negative real zeroes of the f(x) is the same as the number of changes in sign of the coefficients of the terms of f(-x) or less than this by an even number. #polynomials #rationalzerotest #descartesruleofsigns
Views: 28740 Brian McLogan
What are removable and non-removable discontinuties
 
04:34
Learn how to find the removable and non-removable discontinuity of a function. A function is said to be discontinuous at a point when there is a gap in the graph of the function at that point. A discontinuity is said to be removable, when there is a factor in the numerator which can cancel out the discontinuous factor and is said to be non-removable when there is no factor in the numerator which can cancel out the discontinuous factor. To find the discontinuities of a rational function, it is usually useful to factor the expressions in the function and we then set the denominator equal to 0 and solve for x. The value of x for which the factor appears in both the numerator and the denominator is the point of removable discontinuity while the value of x for which the factor appears in only the denominator is the point of non-removable discontinuity. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #rationalfunctions #findasymptotes #rationalfunctions #findasymptotes #graphradicals #findasymptotes
Views: 33212 Brian McLogan
Find the equation of a line through two points using slope intercept form
 
05:04
Learn how to write the equation of a line given two points on the line. The equation of a line is such that its highest exponent on its variable(s) is 1. (i.e. there are no exponents on its variable(s)). There are various forms which we can write the equation of a line: the point-slope form, the slope-intercept form, the standard form, etc. The equation of a line given two points (x1, y1) and (x2, y2) through which the line passes is given by, ((y - y1)/(x - x1)) / ((y2 - y1)/(x2 - x1)). #linearequations #writelinearequations
Views: 95822 Brian McLogan
Solving a System of Equations Using Elimination and Multipliers
 
03:48
In this video series you will learn how to solve a system of two linear equations using elimination. This is also called the addition method because we are combining two equations to eliminate a variable. Which variable you decide to eliminate is up to you but in general we choose to eliminate the variable that has the same coefficients positive and negative. Sometimes we have to multiply one or both equations by a scalar to achieve this situation. We will also explore systems with infinite many solutions and no solutions. #systemsofequations #solvesystemsofequations
Views: 683908 Brian McLogan
How do you convert from standard form to vertex form of a quadratic
 
08:08
Learn how to graph quadratic equations by completeing the square. A quadratic equation is an equation of the form y = ax^2 + bx + c, where a, b and c are constants. The graph of a quadratic equation is in the shape of a parabola which can either face up or down (if x is squared in the equation) or face left or right (if y is squared). To graph a quadratic equation, we need to know some essential parts of the graph including the vertex. The vertex of a parabola is the turning point of the parabola. It is the point on the parabola at which the curve changes from increasing to decreasing or vice-versa. Given a quadratic equation in standard form, we obtain the vertex of the equation by using the process of completing the square to rewrite the equation in the vertex form and hence extract the vertex of the parabola formed by the equation. Knowing the vertex of the graph and the parent graph, we can then apply the required transformation to obtain the required graph. #quadraticequations #graphquadratics
Views: 435337 Brian McLogan
Finding the inverse of a rational function
 
03:44
Learn how to find the inverse of a rational function. A rational function is a function which has an expresion in the numerator and the denominator of the function. The inverse of a function is a function which reverses the "effect" of the original function. One important property of the inverse of a function is that when the inverse of a function is made the argument (input) of a function, the result is x. Given a function, say f(x), to find the inverse of the function, we first change f(x) to y. Next, we change all x to y and y to x. and then we solve for y. The obtained solution for y is the inverse of the original function. #functions #inverseoffunctions
Views: 120319 Brian McLogan
Finding the polynomial when given three zeros - Online Tutor
 
03:42
Learn how to write the equation of a polynomial when given rational zeros. Recall that a polynomial is an expression of the form ax^n + bx^(n-1) + . . . + k, where a, b, and k are constants and the exponents are positive integers. The zeros of a polynomial are the values of x for which the value of the polynomial is zero. To write the equation of a polynomial, we write the given zeros in factor form and expand the product of the factors. Thus, given a, b, . . . as zeros to a polynomial, we write the equation of the polynomial by expanding the factors (x - a)(x - b) . . . = 0 #polynomials #writepolynomial
Views: 101803 Brian McLogan
Solving an Absolute Value Equation
 
05:00
Learn how to solve absolute value equations with multiple steps. Absolute value of a number is the positive value of the number. For instance, the absolute value of 2 is 2 and the absolute value of -2 is also 2. To solve an absolute value equation where there are more terms apart from the absolute value term in the same side of the equality sign as the absolute value term, we first isolate the absolute value term. i.e. make the absolute value term the subject of the formular. After isolating the absolute value term, we now separate the equation into the positive and the negative cases and then solve accordingly. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #absolutevalue #solveabsequations
Views: 134748 Brian McLogan
Learn to solve a system of equations using substitution
 
05:17
Learn how to solve a system of equations by substitution. To solve a system of equations means to obtain a common values of the variables that makes the each of the equation in the system true. To solve a system of equations by substitution, we solve for one of the variables in one of the equations and then substitute for the variable in the other equation and then solve for the other variable. Next we plug in the obtained value of the other variable into the equation for the initial variable we solved for to obtain the value of the variable. The value of the two variables obtained is the solution to the system of equations. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #systemsofequations #solvesystemsofequations
Views: 553168 Brian McLogan
How to find the angle between two vectors
 
03:07
Learn how to determine the angle between two vectors. To determine the angle between two vectors you will need to know how to find the magnitude, dot product and inverse cosine. Then, the angle between two vectors is given by the inverse cosine of the ratio of the dot product of the two vectors and the product of their magnitudes. #trigonometry#vectors #vectors
Views: 71299 Brian McLogan
Learn how to graph a quadratic
 
07:32
Learn how to graph quadratics in standard form. A quadratic equation is an equation whose highest exponent in the variable(s) is 2. To graph a quadratic equation, we make use of a table of values and the fact that the graph of a quadratic is a parabola which has an axis of symmetry, to plot some points to one side of the axis of symmetry and then refrect the plotted points about the axis of symmetry. #quadraticequations #graphquadratics
Views: 108761 Brian McLogan
Simplifying the difference quotient
 
05:10
Learn how to evaluate the limit of a function using the difference quotient formula. The difference quotient is a measure of the average rate of change of the function over an interval, h. The limit of the difference quotient gives the derivative of the function. The difference quotient formula states that the derivative of a function f(x) is the limit as h goes to zer0 of the quotient of the diference between f(x + h) and f(x) and h.
Views: 76948 Brian McLogan
Graph axis of symmetry vertex and max and min, domain and range
 
07:16
Learn about the parts of a parabola. A parabola is the shape of the graph of a quadratic equation. A regular palabola is the parabola that is facing either up or down while an irregular parabola faces left or right. A quadratic equation is an equation whose highest exponent in the variable(s) is 2. The parts of a parabola include: the axis of symmetry (the line passing through the vertex of the parabola to which the parabola is symmetric about), the vertex (the point at which the parabola turns), the domain (the set of possible x-values of the parabola, usually all real numbers for regular parabolas), the range (the possible y-values of the parabola which is usually the region above the vertex inclusive or below the vertex inclusive for regular parabolas), the x-intercepts (the points where the parabola cuts the x-axis) and the y-intercepts (the point(s) where the parabola cuts the y axis. #quadraticequations #graphquadratics
Views: 112285 Brian McLogan
Find the line perpendicular to a line through a given point
 
05:16
Learn how to write the equation of a line that is perpendicular to a given line. The equation of a line is such that its highest exponent on its variable(s) is 1. (i.e. there are no exponents in its variable(s)). There are various forms which we can write the equation of a line: the point-slope form, the slope-intercept form, the standard form, etc. When given a point (x, y) through which a line passes and the slope (m) of the line, the equation of the line is given by y - y1 = m(x - x1). For perpendicular lines, the product of their slopes is -1. Thus given the equation of a line and a point through which the line perpendicular to the given line passes, then the slope of the second line is equal to the negative of the reciprocal of the slope of the given line. Having found the slope, we can then use the formula stated above together with the given point to find the required equation. #linearequations #writelinearequations
Views: 84080 Brian McLogan
Simplifying trigonometric expressions by using pythagorean identities
 
05:22
Learn how to verify trigonometric identities having rational expressions. To verify trigonometric expression means to verify that the terms on the left hand side of the equality sign is equal to the terms on the right hand side. To verify rational trigonometric identities, it is usually more convenient to start with getting rid of the denominator(s) of the rational term(s). This can be done by multiplying both the numerator and the denominator by the conjugate of the denominator, if the denominator involves addition/subtraction or by the reciprocal of the denominator, if the denominator involves product or the expression can be converted to Pythagoras trigonometric identity if possible. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #trigidentities #simplifytrigidentities
Views: 34652 Brian McLogan
Fiinding the standard form of a parabola given focus and directrix
 
06:18
Learn how to write the equation of a parabola given the focus and the directrix. A parabola is the shape of the graph of a quadratic equation. A parabola can open up or down (if x is squared) or open left or right (if y is squared). Recall that the focus and the vertex of a parabola are on the same line of symmetry. When given the focus and the directrix of a parabola, recall that the vertex of a parabola is halfway between the focus and the directrix and the focus is inside the parabola. This enables us to identify the direction which the required parabola opens. We also need to identify the value of p, which is the distance between the vertex and the focus. p is negative when the parabola opens down or left and is positive when the parabola opens right or up. Once we identify the direction and the value of p, we can use the equation of parabola given by (y - k)^2 = 4p(x - h) for parabolas that opens up or down and (x - h)^2 = 4p(y - k) for parabolas that opens left or right. #conicsections #parabolaconicsections
Views: 89643 Brian McLogan
Solve an exponential equation when your base is a fraction
 
02:36
Learn how to solve exponential equations involving fractions. An exponential equation is an equation in which a variable occurs as an exponent. To solve an exponential equation, we make the base of both sides of the equation to be equal so that we can then equate the exponents. When the exponential equation involves a fraction, recall from the laws of exponents, we can get rid of the fraction by taking the negative of the exponent. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #solveexponential #exponentialfunctions
Views: 54897 Brian McLogan
Learning to graph a parabola and determine the vertex focus and directrix
 
04:53
Learn how to graph a horizontal parabola. A parabola is the shape of the graph of a quadratic equation. A parabola is said to be horizontal if it opens to the left or opens to the right. A horizontal parabola results from a quadratic equation in which the y part of the equation is squared. To sketch the graph of a parabola, we first identify the vertex, the focus and the directrix. To do this, we first write the equation in the form (y - k)^2 = 4p(x - h), where (h, k) is the vertex and p is the distance between the vertex and the focus. After expressing the equation in the form (y - k)^2 = 4p(x - h), the vertex is given by (h, k), the focus is given by (h + p, k) and the directrix is given by the line x = h - p. After obtaining the vertex, the focus and the directrix, we can then sketch the parabola. #conicsections #parabolaconicsections
Views: 29360 Brian McLogan
Given the vertices and foci, write the standard equation of an ellipse
 
06:06
Learn how to write the equation of an ellipse from its properties. The equation of an ellipse comprises of three major properties of the ellipse: the major radius (a), the minor radius (b) and the center (h, k). The ellipse is vertical if the major radius in vertical and the ellipse is horizontal if the major radius is horizontal. When given the two foci of the ellipse, the center of the ellipse is halfway between the two foci. When given the vertices of an ellipse, the major radius of an ellipse is the distance between the center of the ellipse and its vertices. Using the pythagoras identity for the relationship between the focal length (distance between the center and the foci) and the radius, we can obtain the minor radius. After obtaining the center, the major and the minor radius, they are plugged into the equation of an ellipse to obtain the desired equation. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #conicsections #ellipseconicsections
Views: 65375 Brian McLogan
Graphing the absolute value function with transformations
 
02:47
Learn about graphing absolute value equations. An absolute value equation is an equation having the absolute value sign and the value of the equation is always positive. The graph of the parent function of an absolute value equation is a v-shaped graph starting from the origin above the x-axis and rising both sides of the y-axis and is symmetrical to the y-axis. To graph an absolute value equation, we first graph the parent function of the absolute value equation and we then apply the necessary transformation(s) to the graph of the parent function to obtain the required graph of the absolute value equation. #absolutevalue #graphabsequations
Views: 128947 Brian McLogan
Write the equation of a circle given the center and a point it passes through
 
03:27
Learn how to write the equation of a circle. A circle is a closed shape such that all points are equidistance (equal distance) from a fixed point. The fixed point is called the center of the circle while the distance between any point of the circle and the center of the circle is called the radius of the circle. To write the equation of a circle, we need to know the length of the radius of the circle and the coordinate point of the center of the circle. Given a circle whose center is at (h, k) and the length of the radius is r, the equation of the circle is given by (x - h)^2 + (y - k)^2 = r^2. #geometry #circles
Views: 140730 Brian McLogan
Using substitution to solve a system
 
04:18
Learn how to solve a system of equations by substitution. To solve a system of equations means to obtain a common values of the variables that makes the each of the equation in the system true. To solve a system of equations by substitution, we solve for one of the variables in one of the equations and then substitute for the variable in the other equation and then solve for the other variable. Next we plug in the obtained value of the other variable into the equation for the initial variable we solved for to obtain the value of the variable. The value of the two variables obtained is the solution to the system of equations. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #systemsofequations #solvesystemsofequations
Views: 108493 Brian McLogan
Find the axis of symmetry and your vertex
 
04:49
Learn about the parts of a parabola. A parabola is the shape of the graph of a quadratic equation. A regular palabola is the parabola that is facing either up or down while an irregular parabola faces left or right. A quadratic equation is an equation whose highest exponent in the variable(s) is 2. The parts of a parabola include: the axis of symmetry (the line passing through the vertex of the parabola to which the parabola is symmetric about), the vertex (the point at which the parabola turns), the domain (the set of possible x-values of the parabola, usually all real numbers for regular parabolas), the range (the possible y-values of the parabola which is usually the region above the vertex inclusive or below the vertex inclusive for regular parabolas), the x-intercepts (the points where the parabola cuts the x-axis) and the y-intercepts (the point(s) where the parabola cuts the y axis. #quadraticequations #graphquadratics
Views: 48146 Brian McLogan
Understanding coterminal angles in trigonometry
 
08:13
Learn the basics of co-terminal angles. An angle is a figure formed by two rays which have a common endpoint. The two rays are called the sides of the angle while the common endpoint is called the vertex of the angle. We measure angles starting from the positive x-axis, i.e. the initial side of an angle measure is usually the positive x-axis. Angle measured in the anti-clockwise direction is called a positive angle while a negative angle is measured in the clockwise direction. Two or more angles are said to be co-terminal when they have the same initial and terminal sides. Coterminal angles are found by adding/subtracting 360 degrees (for degree angle measure) or 2pi (for radian angle measure) to/from the given angle. #trigonometry #anglesintrigonometry
Views: 46489 Brian McLogan
How to write a polynomial in standard form
 
02:41
Learn how to determine the end behavior of the graph of a polynomial function. To do this we will first need to make sure we have the polynomial in standard form with descending powers. We will then identify the leading terms so that we can identify the leading coefficient and degree of the polynomial. The end behavior of a polynomial depends on the leading coefficient (the coefficient of the term with the greatest power) and the degree (the exponent of the term with the greatest power) of the polynomial. If the degree is even and the leading coefficient is positive, the graph of the polynomial rises left and rises right. If the degee is even and the leading coefficient is negative, the graph of the polynomial falls left and falls right. If the degee is odd and the leading coefficient is positive, the graph of the polynomial falls left and rises right. If the degee is odd and the leading coefficient is negative, the graph of the polynomial rises left and falls right. #polynomials #endbehavior #polynomials #endbehavior
Views: 100968 Brian McLogan
Evaluate the six trig functions by when given one value and constraint
 
03:56
Learn how to evaluate the six trigonometric functions given some constraints. When given the value of one trigonometric function, we can use a right triangle with one of its legs on the x-axis and the other leg, perpendicular to the x-axis is drawn such that the reference angle is at the origin. The x-coordinate of the given point represents the adjacent of the reference angle while the y-coordinate represent the opposite of the reference angle. The hypothenuse is the line joining from the origin to the terminal side of the 'opposite' line. Using the Pythagoras theorem, we can obtain any of the unknown sides of the right triangle. Having the opposite, the adjacent and the hypothenuse of the reference angle of the right triangle, we can then evaluate the other trigonometric functions accordingly within the given constraint. #trigonometry #evaluatetrigonometricfunctions
Views: 28621 Brian McLogan
Finding the standard form of a parabola given vertex and focus
 
05:26
Learn how to write the equation of a parabola given the vertex and the focus. A parabola is the shape of the graph of a quadratic equation. A parabola can open up or down (if x is squared) or open left or right (if y is squared). Recall that the focus and the vertex of a parabola are on the same line of symmetry. When given the focus and the vertex of a parabola, recall that the focus of a parabola is inside the parabola. This enables us to identify the direction which the required parabola opens. We also need to identify the value of p, which is the distance between the vertex and the focus. p is negative when the parabola opens down or left and is positive when the parabola opens right or up. Once we identify the direction and the value of p, we can use the equation of parabola given by (y - k)^2 = 4p(x - h) for parabolas that opens up or down and (x - h)^2 = 4p(y - k) for parabolas that opens left or right #conicsections #parabolaconicsections
Views: 136877 Brian McLogan
How to find the vertices and foci of an ellipse
 
08:35
Learn how to graph vertical ellipse not centered at the origin. A vertical ellipse is an ellipse which major axis is vertical. To graph a vertical ellipse, we first identify some of the properties of the ellipse including the major radius (a) and the minor radius (b) and the center. These properties enables us to graph the ellipse. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #conicsections #ellipseconicsections
Views: 137372 Brian McLogan
Graphing and solving for the discontinuity of a rational function
 
02:14
Learn how to find the removable and non-removable discontinuity of a function. A function is said to be discontinuous at a point when there is a gap in the graph of the function at that point. A discontinuity is said to be removable, when there is a factor in the numerator which can cancel out the discontinuous factor and is said to be non-removable when there is no factor in the numerator which can cancel out the discontinuous factor. To find the discontinuities of a rational function, it is usually useful to factor the expressions in the function and we then set the denominator equal to 0 and solve for x. The value of x for which the factor appears in both the numerator and the denominator is the point of removable discontinuity while the value of x for which the factor appears in only the denominator is the point of non-removable discontinuity. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #rationalfunctions #findasymptotes #rationalfunctions #findasymptotes #graphradicals #findasymptotes
Views: 15888 Brian McLogan
Proving two functions are inverses of each other
 
03:31
Learn how to show that two functions are inverses. The composition of two functions is using one function as the argument (input) of another function. In simple terms composition of two functions is putting one function inside another function. Thecomposition of two functions that are inverse to each other yeilds x. To show whether two functions are inverse of each other, we composite the two functions. If the result is x, then the two functions are inverse of each other and they are not inverses otherwise. #functions #inverseoffunctions
Views: 47834 Brian McLogan
Learn how to graph a linear inequality
 
05:07
Learn how to graph linear inequalities written in slope-intercept form. Linear inequalities are graphed the same way as linear equations, the only difference being that one side of the line that satisfies the inequality is shaded. Also broken line (dashes) is used when the linear inequality is 'excluded' (when less than or greater than is used) and a solid line is used when the inequality is 'included' (when greater than or equal to OR less than or equal to is used). To graph a linear inequality in slope intercept form, we first plot the y-intercept and using the slope, we can determine the rise and the run of the required line and then be able to plot the next point from the y-intercept. We then draw a straight line passing through the two plotted points. After the line representing the linear equation form of the linear inequality is drawn, we select a point either side of the line to determine which side of the line is true for the given inequality and then shade the side that satisfies the inequality. #linearinequalities #graphlinearinequalities
Views: 31996 Brian McLogan
Find the central angle given the arc length and radius
 
01:56
Learn how tosolve problems with arc lengths. You will learn how to find the arc length of a sector, the angle of a sector or the radius of a circle. An arc of a circle is the curve between a pair of points on the circumference of the circle. The angle of an arc is the angle sustended by the arc with a pair of radii of the circle at the center of the circle. The portion enclosed by an arc of a circle and a pair of radii of the circle is called a sector. The relationship between the arc length (S), the radius (r), and the angle subtended by the arc at the center (theta), is given by the formula S = r(theta), when theta is in radians. And is given by ((theta)/360) x 2pi r, when theta is in degrees. #trigonometry #anglesintrigonometry
Views: 116645 Brian McLogan
Learn to graph a line in slope intercept form
 
05:33
Learn how to graph linear equations written in slope intercept form. When given a linear equation in slope intercept form, (i.e. in the form y = mx + c, where m is the slope and c is the y-intercept). We first plot the y-intercept and using the slope, we can determine the rise and the run of the required line and then be able to plot the next point from the y-intercept. We then draw a straight line passing through the two plotted points. #linearequations #graphlinearequations
Views: 184306 Brian McLogan
Graphing logarithmic equations
 
05:42
Learn all about graphing logarithmic functions. A logarithmic function is a function with logarithms in them. The graph of the parent function of a logarithmic function usually takes its domain from the positive x-axis. To graph a logarithmic function, it is usually useful to first graph the parent function (without transformations). This can be done by choosing 2-3 points from the function and plotting them on the x-y coordinate axis to see the nature of the parent function's graph. After graphing the parent function, we then apply the given transformations to obtain the required graph. When a constant is added to x in the function, the graph of the parent function shifts to the left by the same units as the constant added to x. Similarly, when a constant is subtracted from x in the function, the graph of the parent function shifts to the right by the same units as the constant subtracted from x. When a constant is added to the function, the graph of the parent function shifts upwards by the same units as the constant added to the function. Similarly, when a constant is subtracted from the function, the graph of the parent function shifts downwards by the same units as the constant subtracted from the function. #graphlogarithmic #logarithms
Views: 48086 Brian McLogan
Using the Leading coefficient test to determine the end behavior of a polynomial
 
06:03
Learn how to determine the end behavior of the graph of a polynomial function. To do this we will first need to make sure we have the polynomial in standard form with descending powers. We will then identify the leading terms so that we can identify the leading coefficient and degree of the polynomial. The end behavior of a polynomial depends on the leading coefficient (the coefficient of the term with the greatest power) and the degree (the exponent of the term with the greatest power) of the polynomial. If the degree is even and the leading coefficient is positive, the graph of the polynomial rises left and rises right. If the degee is even and the leading coefficient is negative, the graph of the polynomial falls left and falls right. If the degee is odd and the leading coefficient is positive, the graph of the polynomial falls left and rises right. If the degee is odd and the leading coefficient is negative, the graph of the polynomial rises left and falls right. #polynomials #endbehavior #polynomials #endbehavior
Views: 81542 Brian McLogan
Finding two coterminal angles given in radians
 
05:02
Learn the basics of co-terminal angles. An angle is a figure formed by two rays which have a common endpoint. The two rays are called the sides of the angle while the common endpoint is called the vertex of the angle. We measure angles starting from the positive x-axis, i.e. the initial side of an angle measure is usually the positive x-axis. Angle measured in the anti-clockwise direction is called a positive angle while a negative angle is measured in the clockwise direction. Two or more angles are said to be co-terminal when they have the same initial and terminal sides. Coterminal angles are found by adding/subtracting 360 degrees (for degree angle measure) or 2pi (for radian angle measure) to/from the given angle. #trigonometry #anglesintrigonometry
Views: 49233 Brian McLogan
Graphing a linear inequality by the x and y intercepts
 
04:50
Learn how to graph linear inequalities written in standard form. Linear inequalities are graphed the same way as linear equations, the only difference being that one side of the line that satisfies the inequality is shaded. Also broken line (dashes) is used when the linear inequality is 'excluded' (when less than or greater than is used) and a solid line is used when the inequality is 'included' (when greater than or equal to OR less than or equal to is used). To graph a linear inequality written in standard form, we first determine the slope and the y-intercept by rewriting the linear inequality in slope intercept form, we then plot the y-intercept and using the slope, we can determine the rise and the run of the required line and then be able to plot the next point from the y-intercept. We then draw a straight line passing through the two plotted points. Alternatively, we can determine the x-intercept and the y-intercept of the standard form linear inequality by subtituting y = 0, then solve for x and substituting x = 0, then solve for y respectively. Recall that the x-intercept is the value of x when y = 0 and the y-intercept is the value of y when x = 0. After obtaining the values of the x-intercept and the y-intercept, we plot the points on the coordinate plane and then draw a line passing through the points. After the line representing the linear equation form of the linear inequality is drawn, we select a point either side of the line to determine which side of the line is true for the given inequality and then shade the side that satisfies the inequality. #linearinequalities #graphlinearinequalities
Views: 64087 Brian McLogan
Find the values a and b that make the piecewise function continuous
 
03:44
Learn how to find the value that makes a function continuos. A function is said to be continous if two conditions are met. They are: the limit of the function exist and that the value of the function at the point of continuity is defined and is equal to the limit of the function. To find the value that makes a function continous we evaluate the right limit, the left limit and the value of the function at the point of discontinuity and then equate the values. We then solve any resulting equation to obtain the desired value that makes the function continuos.
Views: 39159 Brian McLogan
How do we find multiplicity and use it to graph a polynomial
 
09:29
Learn how to use the tools needed to graph a Polynomial function in standard form. The tools we will use to help us graph are end behavior, finding the zeros by factoring synthetic division as well as identify the multiplicity of each zero. The end behavior of the polynomial can be determined by looking at the degree and leading coefficient. Once we know where the graph is going we can find the x-intercepts to obtain a general shape of the graph. We will use the multiplicity the power of each factor to determine if the graph crosses or bounces at each intercept. We use all of this information to sketch the graph. #polynomials #graphpolynomials
Views: 120068 Brian McLogan
How to graph a rational function using 6 steps
 
11:05
Learn how to graph a rational function. To graph a rational function, we first find the vertical and horizontal asymptotes and the x and y-intercepts. After finding the asymptotes and the intercepts, we graph the values and then select some random points usually at each side of the asymptotes and the intercepts and graph the points, this enables us to identify the behavior of the graph and thus enable us to graph the function. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #rationalfunctions #graphrationalfunctions #rationalfunctions #graphrationalfunctions
Views: 233404 Brian McLogan
How to determine, domain range, and the asymptote for an exponential graph
 
08:30
Learn all about graphing exponential functions. An exponential function is a function whose value increases rapidly. To graph an exponential function, it is usually useful to first graph the parent function (without transformations). This can be done by choosing 2-3 points of the equation (including the y-intercept) and ploting them on the x-y coordinate axis to see the nature of the graph of the parent function. After graphing the parent function, we can then apply the given transformations to obtain the required graph. #graphexponential #exponentialfunctions
Views: 150207 Brian McLogan
Learn How to Determine Slant Asymptote of a Rational Function
 
03:55
Learn how to find the slant/oblique asymptotes of a function. A slant (oblique) asymptote usually occurs when the degree of the polynomial in the numerator is higher than the degree of the polynomial in the denominator. To find the slant asymptote of a rational function, we divide the numerator by the denominator using either long division or synthetic division. The quotient obtained when the numerator is divided by the denominator is the slant asymptote of the function. Subscribe: https://www.youtube.com/user/mrbrianmclogan?sub_confirmation=1 Website: http://www.freemathvideos.com Learn from Udemy: https://www.udemy.com/user/brianmclogan2/ Follow us on Facebook: https://www.facebook.com/freemathvideos/ Twitter https://twitter.com/mrbrianmclogan #rationalfunctions #findasymptotes #rationalfunctions #findasymptotes #graphradicals #findasymptotes
Views: 15551 Brian McLogan
Write the equation of a parallel line using point slope form
 
05:25
Learn how to write the equation of a line that is parallel to a given line. The equation of a line is such that its highest exponent on its variable(s) is 1. (i.e. there are no exponents in its variable(s)). There are various forms which we can write the equation of a line: the point-slope form, the slope-intercept form, the standard form, etc. When given a point (x, y) through which a line passes and the slope (m) of the line, the equation of the line is given by y - y1 = m(x - x1). For parallel lines, the slopes are equal. Thus given the equation of a line and a point through which the line parallel to the given line passes, then the slope of the second line is equal to the slope of the given line. Having found the slope, we can then use the formula stated above together with the given point to find the required equation. #linearequations #writelinearequations
Views: 43547 Brian McLogan
Find the equation of a line parallel using slope intercept
 
02:59
Learn how to write the equation of a line that is parallel to a given line. The equation of a line is such that its highest exponent on its variable(s) is 1. (i.e. there are no exponents in its variable(s)). There are various forms which we can write the equation of a line: the point-slope form, the slope-intercept form, the standard form, etc. When given a point (x, y) through which a line passes and the slope (m) of the line, the equation of the line is given by y - y1 = m(x - x1). For parallel lines, the slopes are equal. Thus given the equation of a line and a point through which the line parallel to the given line passes, then the slope of the second line is equal to the slope of the given line. Having found the slope, we can then use the formula stated above together with the given point to find the required equation. #linearequations #writelinearequations
Views: 35845 Brian McLogan
Find parallel lines through a given point
 
04:34
Learn how to write the equation of a line that is parallel to a given line. The equation of a line is such that its highest exponent on its variable(s) is 1. (i.e. there are no exponents in its variable(s)). There are various forms which we can write the equation of a line: the point-slope form, the slope-intercept form, the standard form, etc. When given a point (x, y) through which a line passes and the slope (m) of the line, the equation of the line is given by y - y1 = m(x - x1). For parallel lines, the slopes are equal. Thus given the equation of a line and a point through which the line parallel to the given line passes, then the slope of the second line is equal to the slope of the given line. Having found the slope, we can then use the formula stated above together with the given point to find the required equation. #linearequations #writelinearequations
Views: 17961 Brian McLogan
When given the asymptotes and vertices, find the equation of the hyperbola
 
03:58
Learn how to write the equation of hyperbolas given the characteristics of the hyperbolas. The standard form of the equation of a hyperbola is of the form: (x - h)^2 / a^2 - (y - k)^2 / b^2 = 1 for horizontal hyperbola or (y - k)^2 / a^2 - (x - h)^2 / b^2 = 1 for vertical hyperbola. The center of the hyperbola is given by (h, k). It is halfway between the two vertices and halfway between the two foci. 'a' is the distance from the center to the vertices and 'b' is the distance from the center to the covertices. 'c' is the distance from the center to the foci. The relationship between a, b and c is a^2 + b^2 = c^2. Using these characteristics of the hyperbola, we can then plug them into the standard equation to obtain the equation of the given hyperbola. The values of 'a' and 'b' can also be obtained from the equation of the asymptotes. The equation of the asymptote is given by y = k +/- a/b (x - h) for vertical hyperbola and x = h +/- a/b (y - k) for horizontal asymptote. Note that a hyperbola is vertical when it is facing up and down and is horizontal when it is facing right and left. When a hyperbola is vertical, the vertices and the foci are in the y-axis but they are in the x-axis when the hyperbola is horizontal. #conicsections #hyperbolaconicsections #conicsections #hyperbolaconicsections #conicsections #hyperbolaconicsections
Views: 16213 Brian McLogan

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