Diketahui f(x)= x+1 dan g(x)=2x tentukan (fog) invers (x)

f(x) = x + 1 dan g(x) = 2x
(f o g)(x) = f(g(x)) = g(x) + 1 = 2x + 1

2x + 1 = y => 2x = y - 1 => x = (y - 1)/2

(f o g)^-1(x) = (x - 1)/2 = 1/2 (x - 1)