ГДЗ по алгебре 9 класс Макарычев ФГОС Задание 156

\[\boxed{\text{157.}\text{\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]

\[\textbf{а)}\ y = x^{2} - 4x - 4\]

\[x_{0} = \frac{4}{2} = 2;\]

\[y(2) = 4 - 8 - 4 = - 8.\]

\[Ответ:\ - 8.\]

\[\textbf{б)}\ y = - x^{2} - 4x + 5\]

\[x_{0} = - \frac{4}{2} = - 2;\]

\[y( - 2) = - 4 + 8 + 5 = 9.\]

\[Ответ:9.\]

\[\textbf{в)}\ y = x^{2} - 6x - 6\]

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

\[y(3) = 9 - 18 - 6 = - 15.\]

\[Ответ:\ - 15.\]

\[\textbf{г)}\ y = - x^{2} - 3x + 2\]

\[x_{0} = - \frac{3}{2} = - 1,5;\]

\[y( - 1,5) = - 2,25 + 4,5 + 2 =\]

\[= 4,25.\]

\[Ответ:4,25.\]