Diketahui sebuah fungsi (gof)(x)=4x²+4x dan g(x)=x-1 carilah nilai * f(x) *(fog)(-1)

gof = g(f(x)
gof = 4x^2 + 4x
(x-1)f= 4x^2+4x
4x(x-1)+8x = 4x^2+4x
fx = 4x+8x

fog= f(g(x)
fog = 4(x-1)+8(x-1)
fog = 4x-4+8x-8
fog = 12x-12
fog (-1) = 12(-1)-12

fog= -24