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April 21, 2015

April 21, 2015

Posted by **joe** on Wednesday, September 22, 2010 at 10:49am.

- math -
**bobpursley**, Wednesday, September 22, 2010 at 11:02amchange x^2 = u, and y^2=z

u^2+2uz+9z^2 which is (u+z)^2

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