Answer
False.
Work Step by Step
The sign of $f'(x)$ has to change for there to exist a maximum or a minimum at the critical number.
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 3 - Applications of Differentiation - 3.3 Exercises - Page 186: 95
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