Вопрос:

Ответ:

\[y = 9x(x - 5)\]

\[9x(x - 5) = 0\]

\[9x = 0;\ \ \ \ x - 5 = 0\]

\[x = 0;\ \ x = 5.\]

\[Ответ:x = 0;\ \ x = 5.\]