\[x^{3} - 4x^{2} - 9x + 36 = 0\]
\[x^{2} \cdot (x - 4) - 9 \cdot (x - 4) = 0\]
\[(x - 4)(x - 3)(x + 3) = 0\]
\[x = 4,\ \ x = 3,\ \ x = - 3\]
\[Ответ:x = 4;\ x = \pm 3.\ \]