Решебник по алгебре 7 класс Мерзляк Задание 836

\[\boxed{\text{836\ (836).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ y = 36 - 9x\]

\[y = 36 - 0 = 36,\ \ (0;36)\]

\[36 - 9x = 0\]

\[36 = 9x\ \]

\[\ x = 4,\ \ (4;0)\]

\[Ответ:(0;36);\ \ (4;0).\]

\[2)\ y = x² + x\]

\[y = 0 + 0 = 0,\ \ (0;0)\]

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

\[x(x + 1) = 0\]

\[x = 0,\ \ x = - 1\]

\[Ответ:(0;0);\ \ ( - 1;0).\]

\[3)\ y = 49 - x²\]

\[y = 49 - 0 = 49,\ \ (0;49)\]

\[49 - x^{2} = 0\]

\[(7 - x)(7 + x) = 0\]

\[x = \pm 7\]

\[Ответ:(0;49);(7;0);( - 7;0).\]