Find the sum and choose the correct answer.

Question

2n3 + 4n2 - 7 and -n3 + 8n - 9

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

Answer 1

2n^3 - n^3 = n^3
That eliminates A and C