Find the center of the circle x2+y2−4x+2y−4=0x^2 + y^2 - 4x + 2y - 4 = 0x2+y2−4x+2y−4=0.
(−2,−1)(-2, -1)(−2,−1)
(2,−1)(2, -1)(2,−1)
(2,1)(2, 1)(2,1)
(−2,1)(-2, 1)(−2,1)