diketahui f(x)= x+3 dan g(x)=3x²+ x-7.rumus (gof)(x)=

Kelas 10 Matematika
Bab Fungsi Komposisi

(gof) (x) = g(x + 3)
(gof) (x) = (x + 3)² + (x + 3) - 7
(gof) (x) = x² + 6x + 9 + x + 3 - 7
(gof) (x) = x² + 7x + 5

f(x) = x + 3
g(x) = 3x² + x - 7

gof(x)
= g(f(x))
= g(x + 3)
= (x + 3)² + (x + 3) - 7
= (x² + 6x + 9) + x - 4
= x² + 7x + 5