Answer
Centre = (-1, -6), Radius = 7
Work Step by Step
$x^{2}$ + 2x + $y^{2}$ + 12y - 12 = 0
$(x+1)^{2}$ - 1 + $(y+6)^{2}$ - 36 - 12 = 0
$(x+1)^{2}$ + $(y+6)^{2}$ = 49
Centre = (-1, -6)
Radius = 7
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