Ответ:
\[5x^{3} + 5x = 0\]
\[5x\left( x^{2} + 5 \right) = 0\]
\[1)\ 5x = 0\]
\[x = 0.\]
\[2)\ x^{2} + 5 = 0\]
\[x^{2} = - 5\]
\[нет\ корней.\]
\[Ответ:x = 0.\]
\[5x^{3} + 5x = 0\]
\[5x\left( x^{2} + 5 \right) = 0\]
\[1)\ 5x = 0\]
\[x = 0.\]
\[2)\ x^{2} + 5 = 0\]
\[x^{2} = - 5\]
\[нет\ корней.\]
\[Ответ:x = 0.\]