jika g (x) = x + 1 dan (fog) (x) = x kuadrat + 3x + 1 maka f (x) ...

Bab Fungsi Komposisi
Matematika SMA Kelas X

(fog) (x) = x² + 3x + 1
f(x + 1) = x² + 3x + 1
f(x - 1 + 1) = (x - 1)² + 3 (x - 1) + 1
f(x) = x² - 2x + 1 + 3x - 3 + 1
f(x) = x² + x - 1