Find the sum and choose the correct answer.
2n 3 + 4n 2 - 7 and - n 3 - 8n - 2
n3 + 4 n2 - 8 n - 9
n3 - 4 n2 - 9
- n3 + 4 n2 - 8 n - 9
n3 + 4 n2 - 8 n - 5
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