Answer:
[tex]9n^2 - 5n[/tex]
Step-by-step explanation:
[tex](3n^3 - 5n + n^2) - (-8n^2 + 3n^3)[/tex]
Lets open the brackets. Signs of all the terms in the bracket next to the minus sign will change.
[tex]=> 3n^3 - 5n + n^2 + 8n^2 - 3n^3[/tex]
Now lets add/substract all the like terms with each other.
[tex]=> 3n^3 - 3n^3 + n^2 + 8n^2 - 5n[/tex]
[tex]=> 9n^2 - 5n \: \: or \:\: n(9n - 5)[/tex]
