Question

Find the sum and choose the correct answer.

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

n3 - 4 n2 -9
n3 + 4 n2 - 8 n - 5
n3 + 4 n2 - 8 n - 9
- n3 + 4 n2 - 8 n - 9

Answer 1

\[(2n^3+4n^2-7)+(-n^3-8n-2)\\ 2n^3+4n^2-7-n^3-8n-2\\(2n^3-n^3)+(4n^2)+(-8n)+(-7-2)\\(2-1)n^3+4n^2-8n+(-9)\\n^3+4n^2-8n-9\]

Answer 2

Thanks so much, youve helped a lot

Answer 3

yw~