Diketahui f(x) =5x+2 dan (fog) (x) =32-20x maka g¯¹(x)=

(fog)(x) = 32 - 20x
f(g(x)) = 32 - 20x
5(g(x)) + 2 = 32 - 20x
5(g(x)) = 32 - 20x - 2
5(g(x)) = 30 - 20x
g(x) = (30 - 20x)/5
g(x) = 6 - 4x

g(x) = 6 - 4x
y = 6 - 4x
4x = 6 - y
x = (6 - y)/4
g⁻¹(x) = (6 - x)/4