\[x³ - 2x^{2} - 9x + 18 = 0\]
\[x^{2}(x - 2) - 9 \cdot (x - 2) = 0\]
\[(x - 2)(x - 3)(x + 3) = 0\]
\[x = 2,\ \ x = 3,\ \ x = - 3\]
\[Ответ:x = 2;\ x = \pm 3.\]