2x(x+3)=4(x+3)=>2x(x+3)-4(x+3)=0=>(x+3)(2x-4)=0=>\(\left[{}\begin{matrix}x+3=0\\2x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x+3=0\\x-2=0\end{matrix}\right.\)=>\(\left[{}\begin{matrix}x=-3\\x=2\end{matrix}\right.\)Câu trả lời: 2x(x+3)=4(x+3)=>2x(x+3)-4(x+3)=0=>(x+3)(2x-4)=0=>\(\left[{}\begin{matrix}x+3=0\\2x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x+3=0\\x-2=0\end{matrix}\right.\)=>\(\left[{}\begin{matrix}x=-3\\x=2\end{matrix}\right.\)