Answer
See the figure and steps below.
Work Step by Step
As shown in the figure, for $ x^2-1\geq 0$, we can plot $ y=x^2-1$ for regions $ x\leq -1$ and $ x\geq 1$.
Then, for $ x^2-1\leq 0$, we can plot $ y=1-x^2$ for the region $-1\leq x\leq 1$.