3.) F(x) = 4x + 2 dan g(x) = x - 3 / x + 1, x tdk sama dgn -1. Maka invers dari (gof) (x) adalah... Tolong di jawab

f(x) = 4x + 2
g(x) = (x - 3) / (x + 1)

(g o f) (x) = g(4x + 2)
(g o f) (x) = ((4x + 2) - 3) / ((4x + 2) + 1)
(g o f) (x) = (4x - 1) / (4x + 3)
y = (4x - 1) / (4x + 3)
(4x - 1) = y(4x + 3)
4x - 1 = 4xy + 3y
4x - 4xy = 3y + 1
x (4 - 4y) = 3y + 1
x = (3y + 1) / (4 - 4y)
(g o f) -¹(x) = (3x + 1) / (4 - 4x)