a) f(2) = 1, f(4)= 3
b) f(3) = -2, f(-2) = 3
c) f(-2) = 0, f(0) = 4
d) f(1) = -2, f(3) = 2
e) f(2) = -4, f(-2) = 2
f) f(2) = -1, f(5) = 4
