Hi,

x^2+y^2+12x+10y+61=16

x^2+12x+y^2+10y= -45

x^2+12x+ 36 + y^2 + 10y + 25  = -45 + 36 + 25 

       C(-6,-5)  and r = 4

Standard Form of an Equation of a Circle is  

where Pt(h,k) is the center and r is the radius



 

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