(x^k) - 1 = (x - 1)*(x^(k-1) + x^(k-2) + ... + x + 1)(adsbygoogle = window.adsbygoogle || []).push({});

Where does this factorization come from? I need to know so I can use it in a proof. Thanks.

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# (x^k) - 1 = (x - 1)*(x^(k-1) + x^(k-2) + + x + 1)

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