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

Решение: a) 64 - x² = 0 => x² = 64 => x = ±8 б) 36y² - 25 = 0 => 36y² = 25 => y² = 25/36 => y = ±5/6 в) (5-x)² - x(x+6.5) = 25 => 25 - 10x + x² - x² - 6.5x = 25 => -16.5x = 0 => x = 0