Question

What is the sum of 2n3 + 4n2 - 7 and -n3 + 8n - 9 ?

Answer 1

so is the problem (2n^3 + 4n^2 -7) +( -n^3 +8n -9)

Answer 2

if it is the answer would be n^3 +4n^2 +8n -16

Answer 3

\[(2n^3+4n^2-7)+(-n^3+8n-9)\]
\[2n^3+4n^2-7-n^3+8n-9\]
combine like terms
\[n^3+4n^2+8n-16\]