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Math Help - Another determinant proof, I'm afraid....

  1. #1
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    Sep 2009
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    Another determinant proof, I'm afraid....


    ^^ That's the one...can someone please help me prove it? I'm not allowed to use the "a1(b2*c3-b3*c2)..." formula. I have to use the silly row-column subtraction/addition arithmetic method, where you have to write r1'=r1-r2, c3'=c3-c2, stuff like that after every relevant step...
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  2. #2
    MHF Contributor
    Joined
    Mar 2007
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    Talking

    If you have to show this "the long way", then just do the multiplications, and see what you get. It's long and boring, but pretty straightforward.
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