Solve x^4-2x^3-x^2-2x 1 root

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Question

Simplify the expression

x^{4} - 2 x^{3} - x^{2} - 2 x

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x (x^{3} - 2 x^{2} - x - 2)

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x_{1} = 0, x_{2} \approx 2.658967

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