Jika diketahui F(x) =x² + 3x dan g (x) = x -12, maka nilai ( fog) dan (8) adalah....

(fog) = f(g(x))
= f(x - 12)
= (x - 12)^2 + 3(x - 12)
= x^2 -24x + 144 + 3x - 36
= x^2 -21x + 108
(fog)(8) = (8)^2 -21(8)+108
= 64 -168 + 108
= 4