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posted by Christina on Friday, January 2, 2009 at 1:06pm.

I need help factoring 64b^2-(q+r)^2

difference of two squares (a^2-b^2 =(a-b)(a+b) in general here (8b-(q+r))(8b+(q+r)) = (8b-q-r)(8b+q+r)

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