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x2 + 2x + y2 = 12 (complete the square)
(x2 + 2x + 1)+ y2 = 12 + 1
(x + 1)2 + y2 = 13 (divide by 13 each element to both sides)
(x + 1)2/13 + y2/13 = 1
(x - -1)2/13 + (y - 0)2/13 = 1

Thus, the center of the circle is (-1, 0) and its radius is 1.

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