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Find the centre and the radius of a circle whose equation is
½x− x + ½y2 + y − 7/2 =0

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x2 −2x + y2 + 2y −7 =0
(x −1)2 + (y+1)2 =7+1+1
(x −1)2 + (y+1)2 =9
Centre(1,−1)
radius 3 units

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