Answer:
\(n^3+4n^2+8n-16\)
Step-by-step explanation:
\(2n^3 + 4n^2 - 7 and -n^3 + 8n - 9\)
find the sum of the polynomials
\(2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)\)
Remove the parenthesis and combine like terms
\(2n^3 + 4n^2 - 7 -n^3 + 8n - 9\)
\(2n^3 -n^3=n^3\)
\(-7-9=-16\)
\(4n^2, 8n\) have no like terms
\(2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)=n^3+4n^2+8n-16\)
