Answer
(a) $(-2, 0)$
(b) $(-\infty, -2)$
(c) $(0, +\infty)$
Work Step by Step
(a) The graph is rising from $x=-2$ to $x=0$. Thus, the function is increasing in the interval $(-2, 0)$.
(b) The graph is falling from $-2$ to the left. Thus, the function is decreasing in the interval $(-\infty, -2)$.
(c) The graph is constant (horizontal) from $x=0$ to the right. Thus, the function is constant in the interval $(0, +\infty)$.
