SOLUTION: find the center and radius for this circle x^2-4x+y^2+2y=-1

Question 114763: find the center and radius for this circle
x^2-4x+y^2+2y=-1
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
find the center and radius for this circle
x^2-4x+y^2+2y=-1
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Complete the square on the x-terms and on the y-terms separately.
x^2-4x + 4 + y^2+2y + 1 = -1+4+1
(x-2)^2 + (y+1)^2 = 4
Center: (2,-1)
Radius: 2
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Cheers,
Stan H.
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