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20 May, 21:26

What are the solutions of the equation x6 - 9x3 + 8 = 0? Use u substitution to solve

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  1. 20 May, 21:27
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    X6 - 9x3 + 8 = 0

    let u = x^3

    u^2 - 9u + 8 = 0

    (u-8) (u-1) = 0

    u = 1,8

    back substitute

    1 = x^3

    8 = x^3

    x = 1, 2
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