diketahui f(x) = 2x+5 dan g(x) = x-1/x+5 x tidak sama dengan -5 maka (fog)(x) = ?

(fog)(x)= f(g(x)
= 2(g(x)) + 5
= 2( x - 1 / x + 5 ) + 5
= 2(x-1) + 5(x+5) bagi x+5
= 2x - 2 + 5x + 25 / x + 5
= 7x + 23 / x + 5

Bab Fungsi Komposisi
Matematika SMA Kelas X

(fog) (x) = f((x - 1) / (x + 5))
(fog) (x) = 2 ((x - 1) / (x + 5)) + 5
(fog) (x) = (2x - 2 + 5x + 25) / (x + 5)
(fog) (x) = (7x + 23) / (x + 5)

jika g(x) = (x - 1)/(x + 4)

(fog) (x) = f((x - 1) / (x + 4))
(fog) (x) = (2x - 2 + 5x + 20)/(x + 4)
(fog) (x) = (7x + 18) / (x + 4)