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Math Help - Sigma Notation. I got the answer but still a little bit confused how i got there.

  1. #1
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    Sigma Notation. I got the answer but still a little bit confused how i got there.

    Can some one please help me with this question? I have answered it already although do not understand each stage. Such as the first 8 for example. Rather than carry on I would like some clarification on how I got there and why.
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  2. #2
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    Re: Sigma Notation. I got the answer but still a little bit confused how i got there

    Hey camorris.

    The big hint is knowing that (-1)^2r = 1 for all integer values of r and (-1)^(2r+1) = -1 again for all integer values of r.
    Thanks from topsquark
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