Find the center of the ellipse 9x2+4y2−18x+16y−11=09x^2 + 4y^2 - 18x + 16y - 11 = 09x2+4y2−18x+16y−11=0.
(1,−2)(1, -2)(1,−2)
(−1,2)(-1, 2)(−1,2)
(2,−1)(2, -1)(2,−1)
(1,2)(1, 2)(1,2)