Question

Find the sum and choose the correct answer.

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

A) -n3 - 4n2 - 8n - 16
B) n3 + 4n2 + 8n - 16
C) n3 + 4n2 + 8n + 16
D) 3n3 + 4n2 + 8n - 2

Answer 1

B) n3 + 4n2 + 8n - 16

Explanation:

combine 2n3 - n3 = n3

4n2 stays the same

combine -7 - 9 = -16

8n stays the same

n3 + 4n2 + 8n - 16