Hi! How does one go about the following problem? (a+1)^2 + (a+2)^2 + (a+3)^2 + ... + (a+n)^2 ? I am really stuck, so any help will be appreciated! Thanks
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Originally Posted by Pink Lady Hi! How does one go about the following problem? (a+1)^2 + (a+2)^2 + (a+3)^2 + ... + (a+n)^2 ? $\displaystyle \sum\limits_{k = 1}^n {\left( {a + k} \right)^2 } = \sum\limits_{k = 1}^n {a^2 } + 2a\sum\limits_{k = 1}^n k + \sum\limits_{k = 1}^n {k^2 } $
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