Вопрос:

Ответ:

\[\sqrt{7 - c} + \sqrt{c - 2} = 3\]

\[\left( \sqrt{7 - c} + \sqrt{c - 2} \right)^{2} = 9\]

\[5 + 2\sqrt{(7 - c)(c - 2)} = 9\]

\[2\sqrt{(7 - c)(c - 2)} = 4\]

\[\sqrt{(7 - c)(c - 2)} = 2.\]