\[y = x^{2} - 2x + 3 \Longrightarrow ветви\ \]
\[вверх \Longrightarrow \lbrack 0;3\rbrack\]
\[x_{0} = \frac{2}{2} = 1,\ \ \]
\[y_{0} = 1 - 2 + 3 = 2\]
\[y(0) = 3,\ \ y(3) = 6\]
\[E(y) = \lbrack 2;6\rbrack.\]