Question

Let f(x)=3x+5 and g(x)=x^2.

Answer 1

F(x)= 3x+5 and g(x)= x²

find (f+g)(x)

substitute g(x) into f(x)

3(x²)+5

the answer is C

Answer 2

$3 {x}^{3} + 5 {x}^{2}$