Find the center and radius of a circle by completing the square

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[sirhopitalrule]

The lessons are clear and understandable.

[sufferplenty]

i have a quiz in less than three hours on this that i forgot to study for, you are a life saver to say the least.

[speedjunkie]

Or you can simply divide the coefficients of x and y by 2 and change their signs

[ChavoMysterio]

x^2+y^2-2x+2y-2=0
x^2-2x+y^2+2y=2
x^2-2x+1+y^2+2y+1=2+1+1
(x-1)^2+(y+1)^2=4
Center: (1, -1)
Radius: 2

[kcb-]

I literally don't know how to factor so im gonna fail

[speedjunkie]

Or you can simply divide the coefficients of x and y by 2 and change their signs