#### Answer

f(x)=0
x= 0, 4, or 8

#### Work Step by Step

We know f(x)= y, so when f(x)=0, y=0. Thus, it is a matter of finding x coordinates of points where y=0. We get x= 0, 4, or 8 because those are all of the x coordinates along the graph of f where y=0.