Find f o g.

f(x) = x2 - 5x + 6 g(x) = x + 3
A) x2 + x
B) x2 - 4x + 9
C) x2 - 5x + 9 <my choice
D) x3 - 5x2 - 9x + 18

f◦g = f(g) = g^2-5g+6

= (x+3)^2-5(x+3)+6
= x^2+x