What is x^2+y^2+2x-2y=18 ?

The solution to x^2+y^2+2x-2y=18 is Circle with (a,b)=(-1,1),r=2sqrt(5)

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x^2+y^2+2x-2y=18

x^{2} + y^{2} + 2 x - 2 y = 18

(a, b) = (- 1, 1), r = 25

Solution steps

x^{2} + y^{2} + 2 x - 2 y = 18

Rewrite

x^{2} + y^{2} + 2 x - 2 y = 18

in the form of the standard circle equation

(x - (- 1))^{2} + (y - 1)^{2} = (25)^{2}

Therefore the circle properties are:

(a, b) = (- 1, 1), r = 25

What is x^2+y^2+2x-2y=18 ?
The solution to x^2+y^2+2x-2y=18 is Circle with (a,b)=(-1,1),r=2sqrt(5)