x-4x+2x+7 y= +7

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter13: Sequences And Series
Section13.CT: Chapter Test
Problem 11CT
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Question
3.
X.
y=
Ex-4x+2x*7
2+7
Transcribed Image Text:3. X. y= Ex-4x+2x*7 2+7
Expert Solution
Step 1

Function  y = x3 - 4x2 + 2x + 7

Put x = - 1 

y = (-1)3 - 4(-1)2 + 2(-1) + 7

y = -1 - 4*1 - 2 + 7

y = -1 - 4 - 2 + 7

y = 7 - 7

y = 0

Function  y has a zero at x = - 1  and function y has factor of (x+1)

y = (x + 1)(x2 - 5x + 7)

The graph is shown below

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