What is the vertex of the parabola y=x2−6x+9y = x^2 - 6x + 9y=x2−6x+9?
(3,0)(3, 0)(3,0)
(−3,0)(-3, 0)(−3,0)
(0,3)(0, 3)(0,3)
(0,−3)(0, -3)(0,−3)