Вопрос:

Ответ:

\[(x + 2)\sqrt{x^{2} - 9} = 0\]

\[x + 2 = 0\]

\[\ x = - 2.\]

\[\sqrt{x^{2} - 9} = 0\]

\[x^{2} - 9 = 0\ \ \]

\[x^{2} = 9\ \ \]

\[x = \pm 3.\]