Jika g(x)=(x+1) dan ( fog) =x2+3+1, maka f(x)=

F(x)= 2x+2 kenapa?
Kita coba f(x) = 2x+2, g(x)=x+1
(F o g)(x) = x2+3+1
(F o g)(x) = 2x+4
F(g(x)) = 2x+4
2(x+1)+2 = 2x+4
2x+2+2 = 2x+4
2x+4 = 2x+4 hasil sama.