x(x^2-x)=30x giải pt giúp mình vs

$\color{Orange}{\text{~Orange~}}$

`x(x^2-x)=30x`

`⇔x^3-x^2-30x=0`

`⇔x(x^2-x-30)=0`

`⇔x(x^2+5x-6x-30)=0`

`⇔x[x(x+5)-6(x+5)]=0`

`⇔x(x+5)(x-6)=0`

`⇔`$\left[\begin{matrix} x=0\\ x+5=0\\x-6=0\end{matrix}\right.$

`⇔`$\left[\begin{matrix} x=0\\ x=-5\\x=6\end{matrix}\right.$

Vậy `S={-5;0;6}`