#### Answer

a) $(-\infty;-4)$ & $(-2;\infty)$
b) $(-4;-2)$

#### Work Step by Step

Step 1: Find critical points $f'(x)=0$
Step 2: If $f'(x)$ is positive, the function is increasing
Step 3: If $f'(x)$ is negative, the function is decreasing

Published by
Pearson

ISBN 10:
0321749006

ISBN 13:
978-0-32174-900-0

a) $(-\infty;-4)$ & $(-2;\infty)$
b) $(-4;-2)$

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