markjiron466 markjiron466

13-01-2018
Mathematics

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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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lesliekolleroxrkcf lesliekolleroxrkcf

13-01-2018

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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