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10 February, 11:36

X2 + y2 + 4x - 2y = - 1 is the equation of a circle in the xy-plane. what is the radius of the circle

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  1. 10 February, 13:40
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    After completing the square twice we get

    x²+4x+4 + y²-2y+1 = - 1+4+1=4 so radius = √4=2
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