Решебник по алгебре 7 класс Мерзляк Задание 835

\[\boxed{\text{835\ (835).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]

\[1)\ y = x² - 16x\]

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

\[x^{2} - 16x = 0\]

\[x = 0,\ \ x = 16\]

\[Ответ:(0;0);(16;0).\]

\[2)\ y = |x| - 2\]

\[y = |0| - 2 = - 2,\ \ (0;\ - 2)\]

\[|x| - 2 = 0\]

\[x = 2,\ \ x = - 2\]

\[(2;0),\ \ \ \ \ \ \ \ \ ( - 2;0)\]

\[Ответ:(2;0);( - 2;0);(0;\ - 2).\]

\[3)\ y = x³ - 9x\]

\[y = 0 - 9 \cdot 0 = 0,\ \ (0;0)\]

\[x^{3} - 9x = 0\]

\[x\left( x^{2} - 9 \right) = 0\]

\[x(x - 3)(x + 3) = 0\]

\[x = 0,\ \ x = 3,\ \ x = - 3\]

\[(0;0),\ \ \ \ \ \ \ \ \ (3;0),\ \ \ \ \ \ \ \ \ ( - 3;0)\]

\[Ответ:(0;0);(3;0);( - 3;0).\]

\[4)\ y = 0,8x\]

\[y = 0,8 \cdot 0 = 0,\ \ (0;0)\]

\[0,8x = 0,\ \ x = 0,\ \ (0;0)\]

\[Ответ:(0;0).\]