Find the center and radius of this equation of circle x^2+y^2-ax+by=0

Find the center and radius of this equation of circle x^2+y^2-ax+by=0

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i got (x-a)^2 + (y+b)^2 = (a/2)^2 + (b/2)^2

so the radius must be \[\sqrt{(a/2)^2 + (b/2)^2}\] and center is (a, -b) right?

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