Answer
(c).
Work Step by Step
We plug in $-x$ to get $f(-x)=3\cdot(-x)^4-2\cdot(-x)^3+7(-x)-2=3x^4+2x^3-7x-2.$
Therefore there are $2$ sign changes, hence the answer is (c).
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 4 - Polynomial and Rational Functions - 4.5 The Real Zeros of a Polynomial Function - 4.5 Assess Your Understanding - Page 232: 7
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