Question

Please help Much appreciated ​

Answer 1

Answer:

$6x^3+3x-6$

Step-by-step 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!