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7 January, 10:49

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

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  1. 7 January, 11:20
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    I assume that x6-9x3+8=0 is x^6-9x^3+8=0

    use u=x^3 as substitution

    x^6=x^3*x^3=u*u=u^2

    So the original equation is now:

    u^2-9u+8=0

    Solve this for u than solve u=x^3 to get the x solutions.
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