x^2 y^2-5x-y-4=0

(x-5/2)^2+(y-1/2)^2 =4+25/4+1/4= 4+26/4 =4+13/2=4+6.5 =10.5

(x-2.5)^2+(y-0.5)^2 = (square root of 10.5)^2

Centre (2.5,0.5); Radius =square root of 10.5=3.24

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