Question

What is the sum of 3x^3-2x+8, 2x^2+5x and x^3+2x^2-3x-3
PLEASE HELP

Answer 1

When adding/subtracting variables you can only add/subtract those variable that are of the same power....

3x^3-2x+8+2x^2+5x+x^3+2x^2-3x-3

(3x^3+x^3)+(2x^2+2x^2)+(-2x+5x-3x)+(8-3)

4x^3+4x^2+5

Answer 2

The sum of given expressions is
`4x^3+4x^2+5`.

Explanation:

The given expressions are

`3x^3-2x+8,2x^2+5x,x^3+2x^2-3x-3`

We have find the sum of all these expressions.

`3x^3-2x+8+2x^2+5x+x^3+2x^2-3x-3`

Combine like terms.

`(3x^3+x^3)+(2x^2+2x^2)+(-2x+5x-3x)+(8-3)`

`4x^3+4x^2+(0)+(5)`

`4x^3+4x^2+5`

Therefore the sum of given expressions is
`4x^3+4x^2+5`.