QUESTION 168 The equation $x^2 - 5x + 6 = 0$ has roots (A) $x = 1$ and $x = 6$ (B) $x = 2$ and $x = 3$ (C) $x = -2$ and $x = -3$ (D) $x = 1$ and $x = -6$ (E) $x = -1$ and $x = 6$