الاجابة
f(8) = (1/4) (8)4 + (1/2)(8)3 -4(8)2
f(8) = 1024 + 256 -256 = 1024
f(-2)= (1/4)(-2)4 + (1/2)(-2)3 -4(-2)2
f(-2) = 4 – 4 – 16 = -16