Answer
true.
Work Step by Step
This statement is true, because the Descartes’s Rule of Signs clearly states that if the function $f(x)$ will have only one sign change, then there will be exactly one positive real zero.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 2 - Section 2.5 - Zeros of Polynomial Functions - Concept and Vocabulary Check - Page 377: 9
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