## Precalculus (6th Edition) Blitzer

$f(x)>0$ when $x$ is between $-6$ and $2$ (but not including -6 and 2). In interval notation, $f(x) >0$ when $x$ is within the interval $(-6, 2)$.
Note that $f(x)=y$. The graph has $y>0$ when $x$ is in the interval $(-6, 2)$, which does not include -6 and 2. Thus, $f(x) >0$ when $x$ is greater than -6 but less than 2.