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January 31, 2015

January 31, 2015

Posted by **tonya** on Friday, February 11, 2011 at 10:04pm.

- math -
**helper**, Friday, February 11, 2011 at 10:12pm81x^2 - 54xy + 9y^2

9(9x^2 - 6xy + y^2)

9(3x - y)(3x - y)

9(3x - y)^2

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