\(x^3+3x=0\)
\(\Rightarrow x.\left(x^2+3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x^2+3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x^2=0-3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x^2=-3\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x\in\varnothing\end{matrix}\right.\)
Vậy \(x=0.\)
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\(x^3+3x=0\)
\(x\left(x^2+3\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x^2+3=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x^2=0-3\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x^2=-3\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=0\\x\in\varnothing\end{matrix}\right.\)
Vậy x = 0
( Không biết có đúng hay không)
