Question

\(x^3-4x=0\)

tìm x

Answer 1

\(\Leftrightarrow x\left(x-2\right)\left(x+2\right)=0\)

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

Answer 2

`x^3-4x=0`

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

`<=> [(x=0),(x^2-4=0):} <=> [(x=0),(x=2),(x=-2):}`