Question

What is (f+g)(x)?

Answer 1

(f+g)(x)=x^2-36+x^3+2x^2-10

(f+g)(x)=x^3+3x^2-46

Answer 2

$(f+g)(x)= x^{2} -36+ x^{3} +2 x^{2} -10$

Now, you just combine like terms and put things in the right order, you get:
$x^{3} +3 x^{2} -46$

Hope that helps