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

User Daniel Li
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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
User InbetweenWeekends
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