Answer:
[tex]6x^3+3x-6[/tex]
Step-by-step explanation:
[tex](4x^3-2x-9)+(2x^3+5x+3)[/tex]
Open up the parentheses
[tex]= 4x^3-2x-9+2x^3+5x+3[/tex]
Combine like terms
[tex]= 4x^3-2x-9+2x^3+5x+3\\= 4x^3+2x^3-2x+5x-9+3\\= 6x^3+3x-6[/tex]
I hope this helps!
