jika fungsi (f o g) (x) = 38 - 15x dan g(x) =8-3x maka fungsi f(x) adalah?

g(x) = 8 - 3x
y = 8 - 3x
x = (8 - y)/3

g^-1 (x) = (8 - x)/3

(fog)(x) = F(x) = 38 - 15x

f(x) = F(g^-1 (x))
f(x) = F((8 - x)/3)
f(x) = 38 - 15 . (8 - x)/3
f(x) = 38 - 5(8 - x)
f(x) = 38 - 40 + 5x
f(x) = 5x - 2