Jika (f o g) (x) = 2x – 1 dan g(x) = x+1 maka f(3) =

(fog)(x) = 2x-1

g(x) = x+1
y = x+1
x = y-1

f(g(x)) = 2x-1
f(y) = 2(y-1) -1
f(y) = 2y-3
f(x) = 2x-3
f(3) = 2(3)-3 » 3