Determine the vertex of the parabola y2−4y−8x+20=0y^2 - 4y - 8x + 20 = 0y2−4y−8x+20=0.
(2,2)(2, 2)(2,2)
(1,2)(1, 2)(1,2)
(2,1)(2, 1)(2,1)
(0,2)(0, 2)(0,2)