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11-119.

Complete the squares for both x and y.

(x2 + 8x + 16) + (y2 − 12y + 36) = 12 + 16 + 36

(x + 4)2 + (y − 6)2 = 64

This is the equation of a circle whose center is at (−4, 6) and whose radius is 8.