EBK PRECALCULUS W/LIMITS
EBK PRECALCULUS W/LIMITS
4th Edition
ISBN: 9781337516853
Author: Larson
Publisher: CENGAGE CO
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Chapter 2.1, Problem 55E
To determine

To find : the x-intercept(s) of given quadratic function using both graph and by solving quadratic equation

Expert Solution & Answer
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Answer to Problem 55E

The x-intercept of the given quadratic equation are x=−2.5;    x=6

Explanation of Solution

Given information : f(x)=2x2−7x−30

Concept Involved:

The quadratic function will be of the form f(x)=ax2+bx+c where a, b and c are real numbers with a≠0 . The x-intercepts are the points where the graph of the function cuts the x-axis. The x-intercept can be found by setting up f(x)=0 and solving for x .

To solve a quadratic equation of the form ax2+bx+c=0 we can use the quadratic formula:

  x=−b±b2−4ac2a

To solve the quadratic equation of the form ax2+bx+c=0 we can use factoring method:

  1. Identify a, b and c of the equation
  2. Rewrite the equation like ax2+mx+nx+c=0 where m and n are two numbers whose sum equals b and product equals ac. {List the factor pairs of product and see which two factors add up to give b to get the two numbers m and n}
  3. Factor the greatest common factor of first two terms and greatest common factor of last two terms
  4. Factor the common binomial from the whole expression in the left side.
  5. Applying the Zero Product Property to find the values of , the Principle of Zero Products states that if pq=0 , then either p=0 or q=0 , or both p and q are 0. Once the polynomial is factored, set each factor equal to zero and solve them separately.

Calculation:

Set the given function f(x)=2x2−7x−30 equal to zero

  2x2−7x−30=0

Identify a, b and c of the equation 2x2−7x−30=0

  a=2;  b=−7;   c=−30

Identify two numbers whose sum(b) is -7 and product(ac)is -60 by listing the factor pairs of product  (−60) and seeing which two factors add up to give -7 as its sum.

    1 2 3 4 5 6   −60 −30 −20 −15 −12 −10 ︷−60The numbers are 5 and -12
    because they add up to give -7
    and multiplied to give -60

Use the numbers 5 and -12 to rewrite the middle term of the original equation.

  2x2−12x+5x−30=0

Factor the GCF of first two terms and last two terms

  2x(x−6)+5(x−6)=0

Factor the common binomial in left side of the equation

  (x−6)(2x+5)=0

Set each factor equal to zero and label the equations

  x−6=0  ▸ 1st equation

  2x+5=0  ▸ 2nd equation

Solving the 1stequation x−6=0

  • By adding 6 on both sides, and then
  • Simplifying on both sides

x−6+6=0+6

  x=6

Solving the 2nd equation 2x+5=0

  • By subtracting5 on both sides, and then
  • Simplifying on both sides, and then
  • Dividing by 2 on both sides, and then
  • Simplifying fraction both sides

2x+5−5=0−5

  2x=−5

  2x2=−52

  x=−2.5

List the x-intercepts of the given function

  (−2.5,0)   &   (6,0)

Graph:

  EBK PRECALCULUS W/LIMITS, Chapter 2.1, Problem 55E

Interpretation:

The graph of the function f(x)=2x2−7x−30 cuts the x-axis at x=−2.5     &    x=6

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Chapter 2.1, Problem 54E
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Chapter 2.1, Problem 56E

Chapter 2 Solutions

EBK PRECALCULUS W/LIMITS

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Prob. 14ECh. 2.7 - Prob. 15ECh. 2.7 - Prob. 16ECh. 2.7 - Prob. 17ECh. 2.7 - Prob. 18ECh. 2.7 - Prob. 19ECh. 2.7 - Prob. 20ECh. 2.7 - Prob. 21ECh. 2.7 - Prob. 22ECh. 2.7 - Prob. 23ECh. 2.7 - Prob. 24ECh. 2.7 - Prob. 25ECh. 2.7 - Prob. 26ECh. 2.7 - Prob. 27ECh. 2.7 - Prob. 28ECh. 2.7 - Prob. 29ECh. 2.7 - Prob. 30ECh. 2.7 - Prob. 31ECh. 2.7 - Prob. 32ECh. 2.7 - Prob. 33ECh. 2.7 - Prob. 34ECh. 2.7 - Prob. 35ECh. 2.7 - Prob. 36ECh. 2.7 - Prob. 37ECh. 2.7 - Prob. 38ECh. 2.7 - Prob. 39ECh. 2.7 - Prob. 40ECh. 2.7 - Prob. 41ECh. 2.7 - Prob. 42ECh. 2.7 - Prob. 43ECh. 2.7 - Prob. 44ECh. 2.7 - Prob. 45ECh. 2.7 - Prob. 46ECh. 2.7 - Prob. 47ECh. 2.7 - Prob. 48ECh. 2.7 - Prob. 49ECh. 2.7 - Prob. 50ECh. 2.7 - Prob. 51ECh. 2.7 - Prob. 52ECh. 2.7 - Prob. 53ECh. 2.7 - Prob. 54ECh. 2.7 - Prob. 55ECh. 2.7 - Prob. 56ECh. 2.7 - Prob. 57ECh. 2.7 - Prob. 58ECh. 2.7 - Prob. 59ECh. 2.7 - Prob. 60ECh. 2.7 - Prob. 61ECh. 2.7 - Prob. 62ECh. 2.7 - Prob. 63ECh. 2.7 - Prob. 64ECh. 2.7 - Prob. 65ECh. 2.7 - Prob. 66ECh. 2.7 - Prob. 67ECh. 2.7 - Prob. 68ECh. 2.7 - Prob. 69ECh. 2.7 - Prob. 70ECh. 2.7 - Prob. 71ECh. 2.7 - Prob. 72ECh. 2.7 - Prob. 73ECh. 2.7 - Prob. 74ECh. 2.7 - Prob. 75ECh. 2.7 - Prob. 76ECh. 2.7 - Prob. 77ECh. 2.7 - Prob. 78ECh. 2.7 - Prob. 79ECh. 2.7 - Prob. 80ECh. 2.7 - Prob. 81ECh. 2.7 - Prob. 82ECh. 2.7 - Prob. 83ECh. 2.7 - Prob. 84ECh. 2.7 - Prob. 85ECh. 2.7 - Prob. 86ECh. 2.7 - Prob. 87ECh. 2.7 - Prob. 88ECh. 2.7 - Prob. 89ECh. 2.7 - Prob. 90ECh. 2 - Prob. 1RECh. 2 - Prob. 2RECh. 2 - Prob. 3RECh. 2 - Prob. 4RECh. 2 - Prob. 5RECh. 2 - Prob. 6RECh. 2 - Prob. 7RECh. 2 - Prob. 8RECh. 2 - Prob. 9RECh. 2 - Prob. 10RECh. 2 - Prob. 11RECh. 2 - Prob. 12RECh. 2 - Prob. 13RECh. 2 - Prob. 14RECh. 2 - Prob. 15RECh. 2 - Prob. 16RECh. 2 - Prob. 17RECh. 2 - Prob. 18RECh. 2 - Prob. 19RECh. 2 - Prob. 20RECh. 2 - Prob. 21RECh. 2 - Prob. 22RECh. 2 - Prob. 23RECh. 2 - Prob. 24RECh. 2 - Prob. 25RECh. 2 - Prob. 26RECh. 2 - Prob. 27RECh. 2 - Prob. 28RECh. 2 - Prob. 29RECh. 2 - Prob. 30RECh. 2 - Prob. 31RECh. 2 - Prob. 32RECh. 2 - Prob. 33RECh. 2 - Prob. 34RECh. 2 - Prob. 35RECh. 2 - Prob. 36RECh. 2 - Prob. 37RECh. 2 - Prob. 38RECh. 2 - Prob. 39RECh. 2 - Prob. 40RECh. 2 - Prob. 41RECh. 2 - Prob. 42RECh. 2 - Prob. 43RECh. 2 - Prob. 44RECh. 2 - Prob. 45RECh. 2 - Prob. 46RECh. 2 - Prob. 47RECh. 2 - Prob. 48RECh. 2 - Prob. 49RECh. 2 - Prob. 50RECh. 2 - Prob. 51RECh. 2 - Prob. 52RECh. 2 - Prob. 53RECh. 2 - Prob. 54RECh. 2 - Prob. 55RECh. 2 - Prob. 56RECh. 2 - Prob. 57RECh. 2 - Prob. 58RECh. 2 - Prob. 59RECh. 2 - Prob. 60RECh. 2 - Prob. 61RECh. 2 - Prob. 62RECh. 2 - Prob. 63RECh. 2 - Prob. 64RECh. 2 - Prob. 65RECh. 2 - Prob. 66RECh. 2 - Prob. 67RECh. 2 - Prob. 68RECh. 2 - Prob. 1CTCh. 2 - Prob. 2CTCh. 2 - Prob. 3CTCh. 2 - Prob. 4CTCh. 2 - Prob. 5CTCh. 2 - Prob. 6CTCh. 2 - Prob. 7CTCh. 2 - Prob. 8CTCh. 2 - Prob. 9CTCh. 2 - Prob. 10CTCh. 2 - Prob. 11CTCh. 2 - Prob. 12CTCh. 2 - Prob. 13CTCh. 2 - Prob. 14CTCh. 2 - Prob. 15CTCh. 2 - Prob. 16CTCh. 2 - Prob. 17CTCh. 2 - Prob. 18CTCh. 2 - Prob. 1PSCh. 2 - Prob. 2PSCh. 2 - Prob. 3PSCh. 2 - Prob. 4PSCh. 2 - Prob. 5PSCh. 2 - Prob. 6PSCh. 2 - Prob. 7PSCh. 2 - Prob. 8PSCh. 2 - Prob. 9PSCh. 2 - Prob. 10PSCh. 2 - Prob. 11PSCh. 2 - Prob. 12PSCh. 2 - Prob. 13PS
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