PLZ HELP ASAP FEATURES OF A CIRCLE FROM ITS EXPANDED EQUATION LAST ONE

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We have the following equation:  x2 + y2 + 6y - 72 = 0  Rewriting we have:  x2 + y2 + 6y = 72  Complete squares we have:  x2 + y2 + 6y + (6/2) ^ 2 = 72 + (6/2) ^ 2  x2 + y2 + 6y + (3) ^ 2 = 72 + (3) ^ 2  x2 + y2 + 6y + 9 = 72 + 9  x2 + (y + 3) 2 = 81  So, the center is:  (0, -3)  The radio is:  r = 9  Answer:  (0, -3)  r = 9


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