\[y = x^{2} - 4x - 7;\ \ \ \ \lbrack - 1;5\rbrack.\]
\[Парабола,\ ветви\ вверх,\ координаты\ \]
\[вершины:\]
\[x_{0} = - \frac{b}{2a} = \frac{4}{2} = 2;\ \ \ \]
\[y_{0} = 4 - 8 - 7 = - 11.\]
\[y( - 1) = 1 + 4 - 7 = - 2;\]
\[y(0) = - 7;\]
\[y(5) = 25 - 20 - 7 = - 2.\]
\[E(y) = \lbrack - 11;\ - 2\rbrack.\]