tolong bantu jwab soal no.9-12 sma cranya ya teman

No 9
F(×)=x +2
G(×)=x^2-3×
Maka (g o f) (×),,,,,,,,,,?
Gof(×)=g(f)×
=×(× + 2)^2 - 3(× +2)
=×(×^ + 4x + 4) - 3x -6
=(x^3 +4×^2 + 4x ) -3× -6
= x^3 + x^2 +4× -6


Catatan x^2 =× kuadrat
X^3 = x pangkat 3