Question

The equation x2 + y2 − 2x + 2y − 1 = 0 is the general form of the equation of a circle. What is the standard form of the equation?

Answer 1

anwsers
(x − 1)2 − (y − 1)2 = 1

(x − 1)2 + (y + 1)2 = 3

(x + 1)2 + (y − 1)2 = 1

(x − 1)2 + (y + 1)2 = 1

Answer 2

The standard form of a circle is
(x-h)^2+(y-k)^2=r^2
Here
h=1, k=-1, and r^2=3
Can you figure out the choice?

Answer 3

im so confused right now