\[\boxed{\mathbf{143}.}\]
\[при\ a < 0 \rightarrow y_{наиб} = y_{0};\]
\[при\ a > 0 \rightarrow y_{наим} = y_{0}.\]
\[1)\ y = - 5(x + 3)^{2} + 1\]
\[x_{0} = - 3;\ \ y_{0} = 1.\]
\[Ответ:y_{наиб} = 1.\]
\[2)\ y = \frac{1}{2} \cdot (x - 2)^{2} - 4\]
\[x_{0} = 2;\ \ y_{0} = - 4.\]
\[Ответ:y_{наим} = - 4.\]
\[3)\ y = x^{2} - 4x + 9\]
\[x_{0} = \frac{4}{2} = 2;\ \ y_{0} = 4 - 8 + 9 = 5.\]
\[Ответ:\ y_{наим} = 5.\]
\[4)\ y = - x^{2} + 6x - 1\]
\[x_{0} = \frac{6}{2} = 3;\ \]
\[\ y_{0} = - 9 + 18 - 1 = 8.\]
\[Ответ:y_{наиб} = 8.\]