Rewrite the following equation in the center-radius form of the equation of a circle.

Question

x2 - 2x + y2 + 2y - 2 = 0

Answer 1

just complete the squares as needed, and balance out what you had to change:

x^2-2x+1 + y^2+2y+1 - 2 - (1+1) = 0
(x-1)^2 + (y+1)^2 = 4