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Math Help - linear algebra proof

  1. #1
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    linear algebra proof

    linear algebra proof-mh.jpg

    In this proof where does the exponent 3 come from?
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  2. #2
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    Re: linear algebra proof

    Hey kingsolomonsgrave.

    Look at this page: Determinant -- from Wolfram MathWorld for the identity:

    det(aX) = a^n * det(X) when X is a nxn matrix,
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