Respuesta :

Americ
Add the two functions together and combine all like terms.

(f+g)(x)= (f)(x) + (g)(x)
(f+g)(x)= (8x^2+16x+6)+(x^3-3x^2-9)
(f+g)(x)= x^3+5x^2+16x-3

Hope this helps! :)