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PilotLPTM [1.2K]
4 years ago
15

Find the sum and choose the correct answer.

Mathematics
1 answer:
hodyreva [135]4 years ago
7 0
To put it in the simplest words : 
Get rid of the parentheses and add like so: 
2n^3 - 8n^2 + 7 + n^3 + 8n - 9

<span>Combine like terms
2n^3+n^3= 3n^3
-8n^2 remains the same since there are no like terms for it
8n also remains the same
-9+7=-2
Put all of the numbers together
3n^3-8n^2+8n-2
Final answer:
B - the 2nd one</span>
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