Постройте график функции: y=3x-x^2.

\[y = 3x - x^{2} \Longrightarrow ветви\ вниз\]

\[x_{0} = \frac{- 3}{- 2} = 1,5,\ \ y_{0} = \frac{9}{4} = 2\frac{1}{4}\]

\[\left( 1,5;2\frac{1}{4} \right).\]