Answer
a) $(-\infty,-2)$
b)$(-2,\infty)$
Work Step by Step
Step 1: Find critical point
Step 2: If $f'(x)$ is positive, the function is increasing.
Step 3: If $f'(x)$ is negative, the function is decreasing.
Calculus with Applications (10th Edition)
by Lial, Margaret L.; Greenwell, Raymond N.; Ritchey, Nathan P.
Published by
Pearson
ISBN 10:
0321749006
ISBN 13:
978-0-32174-900-0
Chapter 5 - Graphs and the Derivative - 5.1 Increasing and Decreasing Functions - 5.1 Exercises - Page 260: 3
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