jika f(x)=3x+1 dan(fog)(x)=7x+2maka g(4)

(fog)(x) = 7x + 2
f(g(x)) = 7x + 2
3 . g(x) + 1 = 7x + 2
3g(x) = 7x + 2 -1
3g(x) = 7x + 1
g(x) = (7x + 1)/3

g(4) = (7 . 4 + 1)/3
g(4) = (28 + 1)/3
g(4) = 29/3 = 9 2/3