rumusan fungsi f(x) 2x+1 Dan g(x) 2x mala (fog) -1(5) adalah

(fog)(x)
= 2(2x) +1
= 4x +1

y = 4x + 1
4x = y - 1
x = (y-1)/4
(fog)^-1(x) = (x-1)/4

(fog)^-1(5)
= (5-1)/4
= 4/4 =1