Question

Please help
Much appreciated ​

Answer 1

`6x^3+3x-6`

Explanation:

`(4x^3-2x-9)+(2x^3+5x+3)`

Open up the parentheses

`= 4x^3-2x-9+2x^3+5x+3`

Combine like terms

`= 4x^3-2x-9+2x^3+5x+3\\= 4x^3+2x^3-2x+5x-9+3\\= 6x^3+3x-6`

I hope this helps!