\[2x^{3} - 50x = 0\]
\[2x \cdot \left( x^{2} - 25 \right) = 0\]
\[2x \cdot (x - 5)(x + 5) = 0\]
\[x = 0,\ \ x = 5,\ \ x = - 5\]
\[Ответ:x = 0;\ x = \pm \ 5.\]