Jika f (x)= x^2+2 dan g (x)=x-3 maka (fog)(x)

(fog)(x) = f(g(x))
            = f(x-3)
            = (x-3)^2 +2
            = x^2 -6x+9+2
            = x^2 -6x+11

fog(x) = f(g(x)
= f(x-3)
= (x-3)^2 +2
= x^2 - 6x +9 +2
= x^2 - 6x +11