#### 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.

Published by
Brooks Cole

ISBN 10:
1-28505-709-0

ISBN 13:
978-1-28505-709-5

False.

The sign of $f'(x)$ has to change for there to exist a maximum or a minimum at the critical number.

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