Question

Find the sum

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

A. -n^3 + 4n^2 - 8n - 9

B. n^3 + 4n^2 - 8n - 9

C. n^3 + 4n^2 - 8n - 5

D. n^3 - 4n^2 -9

Answer 1

hint:
\[\begin{gathered}
\left( {2{n^3} + 4{n^2} - 7} \right) + \left( { - {n^3} - 8n - 2} \right) = \hfill \\
= 2{n^3} - {n^3} + 4{n^2} - 8n - 7 - 2 = ...? \hfill \\
\end{gathered} \]

Answer 2

n^3 + 4n^2 - 8n - 9

Answer 3

yes!

Answer 4

Thanks for the help! =)

Answer 5

Thanks! :)