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2 votes
Find the sum and choose the correct answer. 2n^3+4n^2-7 and -n^3+8n-9.

A) -n^3-4^2-8n-16

B) n^3+4n^2+8n+16

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

D) 3 n^3+4n^4+8n-2

2 Answers

5 votes

Answer:

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

Explanation:


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

(Just combine like terms)

Only C)
n^3+4n^2+8n-16 fits our answer.

User Palmtreesnative
by
8.9k points
0 votes

Answer:


{n}^(3) + 4 {n}^(2) + 8n - 16

Option C is the right option

Solution,


2 {n}^(3) + 4 {n}^(2) - 7 + ( - {n}^(3) + 8n - 9) \\ = 2 {n}^(3) + 4 {n}^(2) - 7 - {n}^(3) + 8n - 9 \\

combine like terms


2 {n}^(3) - {n}^(3) + 4 {n}^(2) + 8n - 7 - 9 \\simplify \\ = {n}^(3) + 4 {n}^(2) + 8n - 16

hope this helps...

Good luck on your assignment..

User Dshockley
by
8.0k points

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