Precalculus
Precalculus
9th Edition
ISBN: 9780321716835
Author: Michael Sullivan
Publisher: Addison Wesley
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Chapter 3.3, Problem 52AYU

In Problems 49-54, determine the quadratic function whose graph is given.

Chapter 3.3, Problem 52AYU, In Problems 49-54, determine the quadratic function whose graph is given.

Expert Solution & Answer
Check Mark
To determine

To calculate: The quadratic function using the given graphs.

Answer to Problem 52AYU

The equation of the given graph is f(x) = 2 x 2  - 8x - 2 .

Explanation of Solution

Given:

The given graph is

Precalculus, Chapter 3.3, Problem 52AYU

Formula Used:

The general form of a quadratic equation is f(x) = a (x - h) 2  + k, a  0

This general equation can also be written as f(x) = a x 2  + bx + c, a  0 , where

h = - b 2a and k = f( - b 2a )

If a > 0 , the graph opens upwards.

If a < 0 , the graph opens downwards.

The vertex of the above function is (h, k) = ( -b 2a , f( -b 2a ) ) .

The axis of symmetry will be x =  -b 2a .

We can find the y-intercept by equating the equation at x = 0 .

We can find the x-intercept by equation the equation at y = 0 .

1. If b 2  - 4ac = 0 then the vertex is the x-intercept .

2. If b 2  - 4ac < 0 then the graph has no x-intercept .

3. If b 2  - 4ac > 0 then the vertex is the x-intercept .

Calculation:

Let us consider the quadratic equation of the given graph to be

f(x) = a x 2  + bx + c, a  0    -----(1)

From the given graph, we can see that the y-intercept of the given function is (0, -2) .

We know that the y-intercept is the value of the function at x = 0 , thus, we have

f(0) = -2    -----(2)

At x = 0 , (1) becomes

f(0) = c    -----(3)

Thus, using (2) and (3), we get the value of c = -2 .

Thus, equation (1) becomes

f(x) = a x 2  + bx - 2    -----(4)

Now, we need to find a and b .

We know that a point in a graph is written as ( x, f(x) ) .

The given graph has 2 points (-1, 4) and (-4, -2) .

Consider the point (-1, 4) .

Here, we have x = -1 and f(x) = 4 .

Therefore, substituting it in (4), we get

4 = a ( 1 ) 2  + b(1)  2  a  b = 6     -----(5)

Now, consider the point (-4, -2) .

Here, we have x = -4 and f(x) = -2 .

Therefore, substituting it in (4), we get

2 = a ( 4 ) 2  + b(4)  2  16a  4b = 0  4a  b = 0     -----(6)

In order to find the values of a and b , we have to solve the equations (5) and (6).

Therefore, we have

a - b = 6    -----(5) And

4a - b = 0    -----(6).

Now, on subtracting (5) and (6), we get

-3a = 6  a = -2

On substituting the above value in (5), we get

-2 - b = 6  -2 - 6 = b  b = -8

Therefore, the equation of the given graph is

f(x) = -2 x 2  - 8x - 2

Chapter 3 Solutions

Precalculus

Ch. 3.1 - Prob. 11AYUCh. 3.1 - Prob. 12AYUCh. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 13-20, a linear function is given. a....Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - In Problems 21-28, determine whether the given...Ch. 3.1 - Suppose that f( x )=4x1 and g(x)=2x+5 . a. Solve...Ch. 3.1 - Suppose that f( x )=3x+5 and g(x)=2x+15 . a. Solve...Ch. 3.1 - In parts (a) - (f), use the following figure. a....Ch. 3.1 - In parts (a) - (f), use the following figure. a....Ch. 3.1 - In parts (a) and (b), use the following figure. a....Ch. 3.1 - In parts (a) and (b), use the following figure. a....Ch. 3.1 - In parts (a) and (b), use the following figure. a....Ch. 3.1 - In parts (a) and (b), use the following figure. a....Ch. 3.1 - Prob. 37AYUCh. 3.1 - Prob. 38AYUCh. 3.1 - Prob. 39AYUCh. 3.1 - Prob. 40AYUCh. 3.1 - Prob. 41AYUCh. 3.1 - Prob. 42AYUCh. 3.1 - Prob. 43AYUCh. 3.1 - Prob. 44AYUCh. 3.1 - Prob. 45AYUCh. 3.1 - Prob. 46AYUCh. 3.1 - Prob. 47AYUCh. 3.1 - Prob. 48AYUCh. 3.1 - Prob. 49AYUCh. 3.1 - Prob. 50AYUCh. 3.1 - Prob. 51AYUCh. 3.1 - Prob. 52AYUCh. 3.1 - Which of the following functions might have the...Ch. 3.1 - Which of the following functions might have the...Ch. 3.1 - Under what circumstances is a linear function f( x...Ch. 3.1 - Explain how the graph of f( x )=mx+b can be used...Ch. 3.2 - Plot the points ( 1,5 ),( 2,6 ),( 3,9 ),( 1,12 )...Ch. 3.2 - Find an equation of the line containing the points...Ch. 3.2 - A _____________ is used to help us to see what...Ch. 3.2 - True or False The correlation coefficient is a...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 5-10, examine the scatter diagram and...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - In Problems 11-16, (a) Draw a scatter diagram. (b)...Ch. 3.2 - Candy The following data represent the weight (in...Ch. 3.2 - Tornadoes The following data represent the width...Ch. 3.2 - Video Games and Grade-Point Average Professor...Ch. 3.2 - Prob. 20AYUCh. 3.2 - Prob. 21AYUCh. 3.2 - Prob. 22AYUCh. 3.2 - Prob. 23AYUCh. 3.2 - Prob. 24AYUCh. 3.2 - Prob. 25AYUCh. 3.2 - Prob. 26AYUCh. 3.2 - Prob. 27AYUCh. 3.3 - List the intercepts of the equation y= x 2 9 ....Ch. 3.3 - Prob. 2AYUCh. 3.3 - To complete the square of x 2 5x , you add the...Ch. 3.3 - To graph y= (x4) 2 you shift the graph of y= x 2...Ch. 3.3 - The graph of a quadratic function is called a(n)...Ch. 3.3 - The vertical line passing through the vertex of a...Ch. 3.3 - The x-coordinate of the vertex of f( x )=a x 2...Ch. 3.3 - True or False The graph of f( x )=2 x 2 +3x4 opens...Ch. 3.3 - True or False The y-coordinate of the vertex of f(...Ch. 3.3 - True or False If the discriminant b 2 4ac=0 , the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 13-20, match each graph to one the...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 21-32, graph the function f by...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 33-48, (a) graph each quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 49-54, determine the quadratic...Ch. 3.3 - In Problems 6572, determine, without graphing,...Ch. 3.3 - In Problems 55-62, determine, without graphing,...Ch. 3.3 - In Problems 55-62, determine, without graphing,...Ch. 3.3 - In Problems 55-62, determine, without graphing,...Ch. 3.3 - In Problems, determine, without graphing, whether...Ch. 3.3 - In Problems 55-62, determine, without graphing,...Ch. 3.3 - In Problems, determine, without graphing, whether...Ch. 3.3 - In Problems 55-62, determine, without graphing,...Ch. 3.3 - The graph of the function f( x )=a x 2 +bx+c has...Ch. 3.3 - The graph of the function f(x)=a x 2 +bx+c has...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - In Problems 77-82, for the given functions fandg ,...Ch. 3.3 - Answer Problems 83 and 84 using the following: A...Ch. 3.3 - Answer Problems 83 and 84 using the following: A...Ch. 3.3 - Suppose that f(x)= x 2 +4x21 . 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