Ответ:

x^2 - 5x + 6 = 0

(x-3)(x-2) = 0

x = 3, x = 2

x^2 - x - 6 = 0

(x-3)(x+2) = 0

x = 3, x = -2

x^2 + x - 6 = 0

(x+3)(x-2) = 0

x = -3, x = 2

x^2 + 5x - 6 = 0

(x+6)(x-1) = 0

x = -6, x = 1

x^2 - 2x - 3 = 0

(x-3)(x+1) = 0

x = 3, x = -1

x^2 - x - 6 = 0

(x-3)(x+2) = 0

x = 3, x = -2