1) x^2 - x - 12 = x^2 - 4x + 3x - 12 = x(x + 3) - 4(x + 3) = (x - 4)(x + 3)
ответ: (x - 4)(x + 3)
2) -x^2 + 2x + 35 = -x^2 + 7x - 5x + 35 = 7(x + 5) - x(x + 5) = (7 - x)(x + 5)
ответ: (7 - x)(x + 5)
