\[x^{3} - 36x = 0\]
\[x\left( x^{2} - 36 \right) = 0\]
\[x(x - 6)(x + 6) = 0\]
\[x = 0;\ \ x = 6;\ \ x = - 6\]
\[Ответ:x = 0;\ \ x = \pm 6.\]