\[y = \frac{1}{2}x^{2} - 2x - 4 \Longrightarrow ветви\ \]
\[вверх\]
\[x_{0} = \frac{2}{2 \cdot \frac{1}{2}} = 2,\ \ \]
\[y_{0} = 2 - 4 - 4 = - 6\]
\[(2;\ - 6).\]