5x^2 - x - 6 = 0
x1 = (1 - √1 + 120) / 10 = (1 - √121) / 10 = (1 - 11) / 10 = -10 / 10 = -1
x2 = (1 + 11) / 10 = 1,2
ответ: x = -1; x = 1,2
