a)x^2 - x - 5x + 5 =
x(x-1) - 5(x-1) =
(x-1)(x-5)
b)x^2 - 2x - 6x + 12 =
x(x-2) - 6(x-2) =
(x-2)(x-6)
c)x^2 - 2x - 5x + 10 =
x(x-2) - 5(x-2) =
(x-2)(x-5)
g)Scrisă greșit !
x^2 - 4x - 6x + 24 =
x(x-4) - 6(x-4) =
(x-4)(x-6)
i)x^2 - x - 4x + 4 =
x(x-1) - 4(x-1) =
(x-1)(x-4)