## Precalculus (6th Edition)

(a) $(-\infty, -2) \cup (0, 2)$ (b) $(-2, 0) \cup (2, +\infty)$ (c) The graph has no interval where its value is constant.
(a) The graph is rising from the left up to $x=-2$ as well as from $x=0$ to $x=2$. Thus, the function is increasing in the interval $(-\infty, -2) \cup (0, 2)$. (b) The graph is falling from $x=-2$ to $x=0$ as well as from $x=2$ to the right. Thus, the function is decreasing in the interval $(-2, 0) \cup (2, +\infty)$. (c) The graph has no interval where its value is constant.