\(x^2-2x=24\Leftrightarrow x^2-2x-24=0\Leftrightarrow x^2+4x-6x-24=0\)
\(\Leftrightarrow x\left(x+4\right)-6\left(x+4\right)=0\Leftrightarrow\left(x-6\right)\left(x+4\right)=0\)
\(\Leftrightarrow\left\{{}\begin{matrix}x-6=0\\x+4=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=6\\x=-4\end{matrix}\right.\) vậy \(x=6;x=-4\)
