Ta có :|x(x+10)|=2x
\(\Rightarrow\)\(\left[{}\begin{matrix}x\left(x+10\right)=2x\\x\left(x+10\right)=-2x\end{matrix}\right.\)
\(\Rightarrow\)\(\left[{}\begin{matrix}x+10=2\\x+10=-2\end{matrix}\right.\)
\(\Rightarrow\) \(\left[{}\begin{matrix}x=-8\\x=-12\end{matrix}\right.\)