## Precalculus (6th Edition) Blitzer

$(-\infty,-4)\cup(2,\infty)$
Step 1. Factor the left side to get $(x+4)(x-2)\gt0$ and we can find the boundary points as $x=-4,2$ Step 2. Using the test points to examine the signs on each interval, we have $...(+)...(-4)...(-)...(2)...(+)...$ Step 3. We can find the solution as $(-\infty,-4)\cup(2,\infty)$