Factor x2−11x+28x^2 - 11x + 28x2−11x+28.
(x−4)(x−7)(x - 4)(x - 7)(x−4)(x−7)
(x−1)(x−28)(x - 1)(x - 28)(x−1)(x−28)
(x−2)(x−14)(x - 2)(x - 14)(x−2)(x−14)
(x−3)(x−9)(x - 3)(x - 9)(x−3)(x−9)