Find the centre and the radius of a circle whose equation is½x2 − x + ½y2 + y − 7/2 =0
x2 −2x + y2 + 2y −7 =0(x −1)2 + (y+1)2 =7+1+1(x −1)2 + (y+1)2 =9Centre(1,−1)radius 3 units
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