Question

F(x)=8−4x−x^3

g(x)=x^2+7x−9

Find f(x)+g(x).

Select one:
a. x^3+x^2+3x−1
b. −x^3+x+3x−1
c. −x^3+x^2+11x−9
d. 8x^2+3x−9x^3

Answer 1

its answer is -x^3+x^2+3x-1

Explanation:

f(x) +g(x)

= 8-4x-x^3+x^2+7x-9

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

Answer 2

The value of f(x)+g(x) is
`-x^3+x^2+3x-1`.

Explanation:

The given functions are

`f(x)=8-4x-x^3`

`g(x)=x^2+7x-9`

We have to find the value of f(x)+g(x).

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

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

On combining like terms we get

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

On simplification we get

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

Therefore the value of f(x)+g(x) is
`-x^3+x^2+3x-1`.