Question

Use the functions f(x) and g(x) to answer the question.

f(x)=x^2+3 ; g(x)=x-7

Which expression is equal to (f+g)(x)?

A) x^2+x-4

B) 2x^2-4

C) 2x^2+x-4

D) x^2+x+10

Answer 1

$f(x)=x^2+3\\\\g(x)=x-7\\\\(f+g)(x)=f(x)+g(x)=(x^2+3)+(x-7)=x^2+x-4$

Answer: C)