Question

Find the sum and choose the correct answer.

2n^3 + 4n^2 - 7 and -n^3 + 8n - 9

-n^3 - 4n^2 - 8n - 16
n^3 + 4n^2 + 8n - 16
n^3 + 4n^2 + 8n + 16
3n^3 + 4n^2 + 8n - 2

Answer 1

@geerky42

Answer 2

So you have \[(2n^3 + 4n^2 - 7) + (-n^3 + 8n - 9)\]

Have you tried combine like terms?

Answer 3

thank you soo much