There is no difference between the two expressions you sent, they are both x times n^{2}. I wonder however if you are asking for the difference between x^{n2} and (x^{n})^{2}. If this is what you are asking ook at n = 3.

x^{32} = x^{9} and (x^{3})^{2} = x^{6}.

Penny

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