Diketahui g(x) = 7-3x Dan (fog) (x) = 3x+5. Tentukan a. f(x) b. (gof) (x)

g (x) = 7-3x
(fog)(x)= 3x+5
f ( g (x))=3x+5
f(7-3x)=3x+5
7-3x=t
7-t=3x
7-t per 3 = x

f(t) =3 (coret ) (7-t) per 3 (coret ) + 5
f(t)=7-t+5
f(t)=12-t
f(x)=12-x

itu yg (coret) itu yg 3 ya