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Игорь Киселев
Ответ
6x^3 - 7x + 1 = 0
6x^3 - 6x - x + 1 = 0
6x * (x^2 - 1) - (x - 1) = 0
6x * (x + 1)(x - 1) - (x - 1) = 0
(x - 1) * [6x(x + 1) - 1] = 0
(x - 1) * (6x^2 + 6x - 1) = 0
(x - 1) * {x -(-3-V15)} * {x + (-3+V15)} = 0
x1 = 1
x2 = -3-V15
x3 = -(-3+V15) = 3-V15