F(x) = 2x dan g(x) = 3 -5x hasil dari (gof)pangkat min 1 (x)

(gof)(x) = 3 - 5(2x)
(gof)(x) = 3 - 10x
y = 3 - 10x
10 x = 3 - y
x = (3-y)/10
(gof)^-1(x) = (3-x)/10