Question: Circle equation

Hey there, this is my first post here, so hello to everyone.


I have (so far) one question. I have a circle equation like


I know, that on a paper, I can convert it to the "normal" circle equation, from which I can read the middle point and radius of the circle. And now my question is, how to convert in in maple? I am using the 11th version.


I have tried solving this equation and (x-a)2 + (y-b)2 = r2, but it doesn't return what I want (however it worked, when I had "all" parameters like x2 +y2 +2x -4y -4=0).


Thank you for any of you help, I am sure this is nothing complicated so I get my answer soon ;).

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