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March 1, 2015

March 1, 2015

Posted by **yvonne** on Thursday, May 17, 2007 at 10:52pm.

x^2 -4x + y^2 =0

x^2 -4x +4 + y^2 =4

(x-2)^2 + (y+0)^2=4

look like a circle to me.

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