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Math Help - Expand and simplify 1-(AB - C)^2

  1. #1
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    Expand and simplify 1-(AB - C)^2

    Hi can anybody help me solve this problem. I just cant see how it works

    1-(AB - C)^2 = 1 - A^2 -B^2 - C^2 + 2ABC
    Last edited by mr fantastic; November 25th 2010 at 11:50 AM. Reason: Re-titled.
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  2. #2
    Member Mollier's Avatar
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    Hi,

    are you sure it's not 1-(ab-c)^2 = 1-(ab)^2-c^2+2abc?
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  3. #3
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    No I'm positive its

    1-(AB - C)^2 = 1 - A^2 -B^2 - C^2 + 2ABC

    Thats why I'm really confused
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  4. #4
    Member Mollier's Avatar
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    Then I'm confused as well.
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  5. #5
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    Quote Originally Posted by Turloughmack View Post
    No I'm positive its

    1-(AB - C)^2 = 1 - A^2 -B^2 - C^2 + 2ABC

    Thats why I'm really confused
    Obviously there is a typo in the Right Hand Side. The minus between the A^2 and B^2 should not be there.
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