F(x)=x-1 dan g(x)=x²-7 maka (g o f) (3)=

Mapel : Matematika
Kelas : X SMA
Bab : Fungsi Komposisi dan Fungsi Invers

Pembahasan :
Gof(x) = g(f(x))
Gof(x) = (x - 1)² - 7
Gof(3) = (3 - 1)² - 7
Gof(3) = (2)² - 7
Gof(3) = 4 - 7
Gof(3) = -3

(gof)(x)
=g(f(x))
=(x-1)^2-7
=x^2-2x+1-7
=x^2-2x-6
(gof)(3)=
3^2-2.3-6
=9-6-6
=-3