Find the vertex of the parabola x=y2−4y+4x = y^2 - 4y + 4x=y2−4y+4.
(0,2)(0, 2)(0,2)
(2,0)(2, 0)(2,0)
(4,−4)(4, -4)(4,−4)
(−4,4)(-4, 4)(−4,4)