(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the centre and radius of the circlex²+y²-4x+2y+6=0

I have the solution. The circle is no defined because r² = -1 is impossible.

But... how do I even DO that equation to get the answer -1?!

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# Homework Help: Analytic Geometry I - Circle

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