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5 votes
Find the sum and choose the correct answer.

2n 3 + 4n 2 - 7 and -n 3 + 8n - 9

2 Answers

3 votes
2n³ + 4n² - 7
+
-n³ + 8n - 9
______________
n
³ + 4n² + 8n - 16

just add / subtract like terms; carry the others along like 4n² and 8n since they don't have like terms
User Danivicario
by
8.2k points
1 vote

Answer:


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

Explanation:


2n^3 + 4n^2 - 7 and -n^3 + 8n - 9

find the sum of the polynomials


2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)

Remove the parenthesis and combine like terms


2n^3 + 4n^2 - 7 -n^3 + 8n - 9


2n^3 -n^3=n^3


-7-9=-16


4n^2, 8n have no like terms


2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)=n^3+4n^2+8n-16

User JoelPrz
by
8.5k points

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