\[\boxed{\text{1060.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[Имеет\ 2\ корня\ при\ D > 0.\]
\[x^{2} - (2b - 2)x + b^{2} - 2b = 0,\]
\[\ \ a = 1,\ \ b = - (2b - 2),\]
\[c = b^{2} - 2b\]
\[D = \left( - (2b - 2) \right)^{2} - 4 \cdot 1 \cdot\]
\[\cdot \left( b^{2} - 2b \right) = 4b^{2} - 8b + 4 -\]
\[- 4b^{2} + 8b = 4\]
\[x_{1,2} = \frac{2b - 2 \pm 2}{2} = b - 1 \pm 1\]
\[\left\{ \begin{matrix} b - 1 + 1 = b \\ b - 1 - 1 = b - 2 \\ \end{matrix} \right.\ ,\ \ \]
\[- 5 < b < 5,\ \ \]
\[- 5 < b - 2 < 5\]
\[- 3 < b < 7 \Longrightarrow \ \ b \in ( - 3;5)\]
\[Ответ:при\ b \in ( - 3;5)\text{.\ }\]