Answer:
n³ + 4n² - 8n - 9
Explanation:
(2n³ + 4n² - 7) + (-n³ - 8n - 2)
2n³ + 4n² - 7 - n³ - 8n - 2
2n³ - n³ + 4n²- 8n - 7 - 2
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