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Math Help - Indicies

  1. #1
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    Indicies

    How could you factorise
    (-1)^{k-1} + (-1)^{k}
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  2. #2
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    Quote Originally Posted by Ifailatmaths View Post
    How could you factorise
    (-1)^{k-1} + (-1)^{k}
    The common factor is (-1)^{k-1}. Note: (-1)^k = (-1)^{k-1} (-1).
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