Решебник по алгебре 9 класс Мерзляк Задание 353

\[\boxed{\text{353\ (353).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ f(x) = - x^{2} + 6x - 7\]

\[x_{0} = \frac{- 6}{- 2} = 3\]

\[y_{0} = - 9 + 18 - 7 = 2\]

\[Oy:\]

\[x = 0;\ \ y = - 7.\]

\[f(1) = - 1 + 6 - 7 = - 2.\]

\[q(x) = - \sqrt{x}\]

\[Ответ:два\ корня.\]

\[2)\ f(x) = 4x - 2x^{2}\]

\[x_{0} = \frac{- 4}{- 4} = 1;\]

\[y_{0} = 4 - 2 = 2.\]

\[\text{Ox}:\]

\[2x(2 - x) = 0\]

\[x = 0,\ \ (0;0)\]

\[x = 2,\ \ (2;0)\text{.\ }\]

\[\text{Oy}:\ \ \ \]

\[\ y = 0;(0;0).\]

\[f( - 1) = - 4 - 2 = - 6.\]

\[q(x) = - \frac{4}{x}\]

\[Ответ:1\ корень.\]