I can't figure out n3 -2n2 (n+1)  that's n to the 3rd power  -2n to the second power (n+1). And please, how do I make a superscript?

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first, distribute the parentheses (multiply the quantity (n+1) by -2n^2):n^3-2n^3-2n^2and then combine like terms:-n^3-2n^2(use the chevron to write powers: n squared = n^2)

make superscript by copy and pasting it :P