\[y = x^{2} + 6x + 5;\ \ \ x \in \lbrack - 6;2\rbrack\]
\[x_{0} = - \frac{b}{2a} = - \frac{6}{2} = - 3;\ \ \ \]
\[y_{0} = 9 - 18 + 5 = - 4.\]
\[y(2) = 4 + 12 + 5 = 21.\]
\[E(y) = \lbrack - 4;21\rbrack.\]