The f(-2) is the value of y at which the x =-2
In the given graph
at x =-2
The F(x) is at 1
Thus,
f(-2) = 1
2). f(1)
at x =1
the value st y is 1
So,
f(1)=1
3) f(x) =0
Here we have to find the value of x at which the y =0
So, when y=0 then the x =-1,4,-3
SO,
f(x)=0
then x = -1, -3, 4