3. Решите уравнение: a) 8² - x² = 0 б) 36y² - 25 = 0 в) (5 - x)² - x(x + 6,5) = 25

a) 8² - x² = 0 64 - x² = 0 x² = 64 x = ±√64 x = ±8 б) 36y² - 25 = 0 36y² = 25 y² = 25/36 y = ±√(25/36) y = ±5/6 в) (5 - x)² - x(x + 6.5) = 25 25 - 10x + x² - x² - 6.5x = 25 25 - 10x - 6.5x = 25 -16.5x = 0 x = 0 **Ответ:** a) x = 8, x = -8 б) y = 5/6, y = -5/6 в) x = 0