Đặt \(x^2-2x=t\)
\(2t^2+3t+1=0\Rightarrow\left[{}\begin{matrix}t=-1\\t=-\frac{1}{2}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x^2-2x=-1\\x^2-2x=-\frac{1}{2}\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x^2-2x+1=0\\2x^2-4x+1=0\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=1\\x=\frac{2\pm\sqrt{2}}{2}\end{matrix}\right.\)