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x2 + y2 - 5y + 4 = 0

x2 + y2 - 5y = - 4

x2 + y2 - 5y + 25/4 = - 4 + 25/4 = 9/4

x2 + (y - 5/2)2 = (3/2)2

Centre = (0, 5/2) and radius = 3/2

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Q: Find the center and radius of a circle with equation X2 plus y2 plus x equals 0?
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