f(x)=x+3 (fog)(x) = x^2 +bx + 7 maka g(x)=

(fοg)(x)=x²+bx+7
f(x)=x+3
f(x)=?

(fog)(x)= x²+bx+7
f(g(x))= x²+bx+7
Misal
f(x)=t
t=x+3
t-3=x
g(t)=(t-3)²+b(t-3)+7
=t²-6t+9+bt+b3+7
=t²-6t+bt+16
g(x)= x²-6x+bx+16