Write the function x³ + 8x² + 19x + 12 in factored form knowing that one of the roots is -1.
O (x-6)(x-2)(x - 1)
O(x+3)(x + 1)(x + 4)
O(x + 1)(x + 2)(x+6)
O(x-4)(x-3)(x - 1)