\(-3x^2-6x+3x\left(2-x^2\right)=0\Leftrightarrow-3x\left(x+2-2+x^2\right)=0\Leftrightarrow-3x\left(x+x^2\right)=0\Leftrightarrow-3x^2\left(x+1\right)=0\Leftrightarrow\left[{}\begin{matrix}-3x^2=0\\x+1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)Vậy ....