Jika g(x) =2x-1 dan fog (x) =4-x, tentukan f(5)

g(x) = 2x - 1
(fog)(x) = 4 - x

maka
(fog)(x) = 4 - x
f(g(x)) = 4 - x
f(2x - 1) = 4 - x
f(x) = 4 - (x + 1)/2
f(x) = 8/2 - (x + 1)/2
f(x) = (7 - x)/2

f(5) = (7 - 5)/2
f(5) = 2/2 
f(5) = 1