X^2-4x+y^2+12y=-4

X^2-4x+2^2+y^2+12y+6^2=-4+2^2+6^2 , add 2^2+6^2 to both sides

(x-2)^2+(y+6)^2 = - 4+4+36

(x-2)^2+(y+6)^2 = 36

(x-2)^2+(y+6)^2 = 6^2

center = ( 2 , - 6) & radius = 6

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