Question

x^3 - 4x = 0

Answer 1

`x^3 - 4x = 0`

`x.(x^2-4)=0`

`=> x.(x-2).(x+2)=0`

`=>` \(\left[{}\begin{matrix}x=0\\x-2=0\\x+2=0\end{matrix}\right.\)

`=>` \(\left[{}\begin{matrix}x=0\\x=0+2=2\\x=0-2=-2\end{matrix}\right.\)

Vậy....

Answer 2

`-> x(x^2-4)=0`

`-> x(x+2)(x-2)=0`

`=>` \(\left[{}\begin{matrix}x=0\\x=2\\x=-2\end{matrix}\right.\)