ГДЗ по алгебре 8 класс Макарычев Задание 583

\[\boxed{\text{583\ (583).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

Пояснение.

Решение.

\[\textbf{а)}\ x^{2} - 9x + 20 = 0\]

\[\left\{ \begin{matrix} x_{1} + x_{2} = 9 \\ x_{1}x_{2} = 20\ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\left\{ \begin{matrix} x_{1} = 4 \\ x_{2} = 5 \\ \end{matrix} \right.\ \]

\[\textbf{б)}\ x^{2} + 11x - 12 = 0\]

\[\left\{ \begin{matrix} x_{1} + x_{2} = - 11 \\ x_{1}x_{2} = - 12\ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\left\{ \begin{matrix} x_{1} = - 12 \\ x_{2} = 1\ \ \ \ \ \\ \end{matrix} \right.\ \]

\[\textbf{в)}\ x^{2} + x - 56 = 0\]

\[\left\{ \begin{matrix} x_{1} + x_{2} = - 1 \\ x_{1}x_{2} = - 56\ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\left\{ \begin{matrix} x_{1} = 7\ \ \\ x_{2} = - 8 \\ \end{matrix} \right.\ \]

\[\textbf{г)}\ x^{2} - 19x + 88 = 0\]

\[\left\{ \begin{matrix} x_{1} + x_{2} = 19 \\ x_{1}x_{2} = 88\ \ \ \ \ \ \\ \end{matrix} \right.\ \text{\ \ \ \ \ \ }\left\{ \begin{matrix} x_{1} = 11 \\ x_{2} = 8\ \ \\ \end{matrix} \right.\ \]