ГДЗ по алгебре 9 класс Макарычев Задание 573

\[\boxed{\text{573}\text{\ (573)}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[\textbf{а)}\ x² + x - 42 \leq 0\]

\[x^{2} + x - 42 = 0\]

\[x_{1} + x_{2} = - 1;\ \ \ \ \ x_{1} \cdot x_{2} = - 42\]

\[x_{1} = - 7;\ \ x_{2} = 6.\]

\[(x + 7)(x - 6) \leq 0\]

\[- 7 \leq x \leq 6.\]

\[\textbf{б)}\ (x + 11)(x + 4)(x - 1) > 0\]

\[x = - 11;\ \ x = - 4;\ \ x = 1\]

\[x \in ( - 11;\ - 4) \cup (1;\ + \infty).\]