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# Algebra help!

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What is the sum of the following expression:

\( (a +(2n+1)d)^2- (a + (2n)d)^2 +(a + (2n-1)d)^2 - (a+(2n-2)d)^2 + \cdots + (a+d)^2 - a^2.\)

Any help would be appreciated

Jul 26, 2020