jika f(x)=x-2 dan g(x) =3x+5 maka (gof)-1 adalah

(gof)(x) = 3(x-2) + 5
(gof)(x) = 3x - 1
y = 3x - 1
3x = y + 1
x = (y+1)/3
(gof)^-1(x) = (x+1)/3