√15-x+√3-x=6 Heeeeeeeeeeeeelp

15 - x + 2√(15 - x)(3 - x) + 3 - x = 36  18 - 2x + 2√(15 - x)(3 - x) - 36 = 0  /:2 9 - x + √(15 - x)(3 - x) - 18 = 0  √(15 - x)(3 - x) = x + 9 (15 - x)(3 - x) = x^2 + 18x + 81 45 - 18x + x^2 = x^2 + 18x + 81 - 18x + 45 = 18x + 81 - 18x - 18x = 81 - 45 - 36x = 36 x = - 1 Проверка √(15 + 1) + √(3 + 1) = 6 √16 + √4 = 6 4 + 2 = 6  6  = 6