What is (f+g)(x)?
f(x)=x^3−x
g(x)=x^3+2x^2−10
(f+g)(x)
= f(x) + g(x)
= (x3 - x) + (x3 + 2x2 - 10)
= x3 - x + x3 + 2x2 - 10
= 2x3 + 2x2 - x - 10
