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

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

(fog)(x) = 38 - 15x
f(a) = 38 - 15 (8 - a)/3
f(a) = 38 - 5(8 - a)
f(a) = 38 - 40 + 5a
f(a) = -2 + 5a
f(a) = 5a - 2

Maka,
f(x) = 5x - 2