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October 21, 2014

October 21, 2014

Posted by **Michael** on Thursday, September 17, 2009 at 8:57pm.

Can anyone explain this one to me?

- math -
**MathMate**, Friday, September 18, 2009 at 12:28pmThinking about how this can help you:

x²-y² = (x-y)(x+y)

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