[tex]\displaystyle\bf\\2x^{3}+2x^{2} =0\\\\2x^{2} (x+1)=0\\\\\\\left[\begin{array}{ccc}x^{2} =0\\x+1=0\end{array}\right\\\\\\\left[\begin{array}{ccc}x_{1} =0\\x_{2} =-1\end{array}\right\\\\\\Otvet: \ 0 \ \ ; \ \ -1[/tex]