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; Nov 25th 2010 at 11:50 AM. Reason: Re-titled.
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Hi, are you sure it's not $\displaystyle 1-(ab-c)^2 = 1-(ab)^2-c^2+2abc$?
No I'm positive its 1-(AB - C)^2 = 1 - A^2 -B^2 - C^2 + 2ABC Thats why I'm really confused
Then I'm confused as well.
Originally Posted by Turloughmack 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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