\[\boxed{\mathbf{742\ (742).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[x^{2} + bx + c = 0\]
\[x_{1} \cdot x_{2} = c\]
\[x_{1} + x_{2} = - b\]
\[Если\ x_{1} = b;\ \ x_{2} = c:\]
\[bc = c,\ \ b = 1\]
\[b + c = - b \Longrightarrow c = - 2\]
\[или\ \]
\[b = c = 0\]
\[Ответ:b = 1;\ \ c = - 2\ \ \ \ или\ \ \ \]
\[b = 0;\ \ c = 0.\]