Diketahui f(x) =3x, g(x) =2-5x, maka(fog) -¹(x) adalah...

f(x) = 3x
g(x) = 2 - 5x

(fog) (x) = f(2 - 5x)
(fog) (x) = 3(2 - 5x)
(fog) (x) = 6 - 15x
y = 6 - 15x
15x = 6 - y
x = (6 - y) / 15
(fog)-¹(x) = (6 - x) / 15