Ответ: 13
Пошаговое объяснение:
1) Сначала найдём область допустимых значений x



х ∈ (-∞; 4 - √13] U [4 + √13; +∞)
2) Пусть
, тогда 
Составляем уравнение и находим корни:


t = 4; t = 2.
t² = 16; t² = 4
3) Находим х




Все корни принадлежат области допустимых значений.
Находим произведение корней уравнения:
(4 - √17)(4 + √17)(4 - √29)(4 + √29) = (16 - 17) (16-29) = (-1) * (-13) = 13
Ответ: 13