Ответы на вопрос:
X(x^2 - 2) = x^3 + 8 x^3 - 2x = x^3 + 8 x^3 - 2x - x^3 - 8 = 0 - 2x - 8 = 0 - 2x = 8 2x = - 8 x = - 4
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