Объяснение:

[tex] - \frac{1}{3} {x}^{2} - x + 6 \\ \frac{1}{3} \times ( - {x}^{2} - 3x + 18) \\ \frac{1}{3} \times ( - {x}^{2} + 3x - 6x + 18) \\ \frac{1}{3} \times ( - x \times (x - 3) - 6x(x - 3)) \\ \frac{1}{3} \times ( - (x - 3) \times (x + 6)) \\ - \frac{1}{3} \times (x - 3) \times (x + 6)[/tex]