Answer
a) $x=-1,0,1,3$
b) $-1\leq x\leq0\cup1\leq x\leq3$
Work Step by Step
According to the graph:
a) $x=-1,0,1,3$. These are the points where the graph intersects the x-axis ($y=0$).
b) $-1\leq x\leq0\cup1\leq x\leq3$. These are the regions where the graph is under the x-axis (below $y=0$).
