Answer
(a) $(-1,0)\cup(1,\infty)$.
(b) $(-\infty,-1)\cup[0,1)$.
Work Step by Step
(a) Based on the given graph, we can identify the solution for $f(x)\lt0$: $(-1,0)\cup(1,\infty)$.
(b) Based on the given graph, we can identify the solution for $f(x)\ge0$: $(-\infty,-1)\cup[0,1)$.
