jika g(x)=x+1 dan (fog)(x)=X2+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