f(x)=x²+6x-16 9(x)=x+8

(fog)(x) = f(x+8)
(fog)(x) = (x+8)² + 6(x+8) -16
(fog)(x) = x² + 16x + 64 + 6x + 48 - 16
(fog)(x) = x² + 22x + 96

Trimakasih . Semoga bermanfaat.
Rifandi.