\[x^{3} - 36x = 0\]
\[x\left( x^{2} - 36 \right) = 0\]
\[1)\ x = 0.\]
\[2)\ x^{2} - 36 = 0\]
\[x^{2} = 36\]
\[x = \pm 6.\]
\[Ответ:x = 0;x = \pm 6.\]