Answer:
Correct answer is:
n³+4n²-8n-9
Step-by-step explanation:
We have to find the sum of:
2n³ + 4n² - 7 and -n³ - 8n - 2
On adding both terms:
2n³ + 4n² - 7 + (-n³ - 8n - 2)
= 2n³ - n³ + 4n² - 8n - 7 - 2
= n³+4n²-8n-9
Hence, sum of 2n³ + 4n² - 7 and -n³ - 8n - 2 is:
n³+4n²-8n-9
