Question

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

Answer 1

\[2n^3 -8n^2+7 + n^3 +8n -9\]
combine like terms

for example :
\[2n^3 + n^3 = 3n^3\]
can you do the rest?