Find the vertex of the parabola y=2x2−8x+5y = 2x^2 - 8x + 5y=2x2−8x+5.
(2,−3)(2, -3)(2,−3)
(2,5)(2, 5)(2,5)
(−2,21)(-2, 21)(−2,21)
(1,−1)(1, -1)(1,−1)