Answer
(d).
Work Step by Step
This parabola is opening upward with a minimum at $x=0$. Its derivative will be negative when $x\lt0$, zero at $x=0$, and positive when $x\gt0$, matching graph-(d).
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 11 - Section 11.4 - Introduction to Derrivatives - Exercise Set - Page 1176: 73
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