Question

Use f (x)=7 and g (x)=x+5 to evaluate (f+g)(3)=

Answer 1

(f+g)(3)=f(3)+g(3)

f(x)=7 so f(3)=7
g(x)=x+5 so g(3)=3+5=8

(f+g)(3)=f(3)+g(3)=7+8=15