Question

F(x) = 9 - X
g(x) = 5x + 2x + 1

Encontre (F+g)(X)

Answer 1

5x^2 + x + 10

Explanation:

you appear to have a typo. I'd say

(f+g)(x) = f(x) + g(x) = 9-x + 5x^2+2x+1 = 5x^2 + x + 10