To put it in the simplest words : Get rid of the parentheses and add like so: <span>Combine like terms 2n^3+n^3= 3n^3 -8n^2 remains the same since there are no like terms for it 8n also remains the same -9+7=-2 Put all of the numbers together 3n^3-8n^2+8n-2 Final answer: B - the 2nd one</span>
