Question

F(x)=8−4x−x³
g(x)=x²+7x−9
Find f(x)+g(x).

Answer 1

See below

Explanation:

`f(x)=8-4x-x^3\\g(x)=x^2+7x-9`

Once

`(f+g)(x)=f(x)+g(x)`

`(f+g)(x)=(8-4x-x^3)+(x^2+7x-9)=-x^3+x^2+3x-1`

`\therefore (f+g)(x)=-x^3+x^2+3x-1`

Answer 2

-x^3+x^2+3x-1

Explanation:

f(x)=8−4x−x³

g(x)=x²+7x−9

f(x)+g(x) = 8−4x−x³ +x²+7x−9

Combine like terms

=-x^3+x^2+3x-1