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


Please write all of the steps! There was another post on this question, but I didn't get how the guest got the answer.

 Jun 24, 2020
edited by Guest  Jun 25, 2020

For the community: Please don't submit solutions to this problem. This is a homework problem for an online course that does not allow students to search for answers to specific problems outside of the school.


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 Sep 10, 2020

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