Question

Решите уравнение 5x^3-40x=0

Answer 1

$5 {x}^{3} - 40x = 0 \\ {x}^{3} - 8x = 0 \\ x( {x}^{2} - 8) = 0 \\ \left[ \begin{gathered} x = 0 \\ {x}^{2} = 8 \end{gathered} \right. \\ \left[ \begin{gathered} x = 0 \\ x = \pm 2 \sqrt{2} \end{gathered} \right.$