Answer:
3d+18
Step-by-step explanation:
x^2+2x -6
f(x)=2x+1
g(x)=x^2-7
(f+g)(x)= 2x+1+x^2-7
Combine like terms
= x^2+2x -6
g(2)=(4x) +2=7y
g(3)=4(x+2)