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12 September, 14:49

If x^2+2=3^2/3+3^-2/3 then prove that 3x^3+9x-8=0

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Answers (2)
  1. 12 September, 17:16
    0
    here is the solution
  2. 12 September, 18:35
    0
    See below.

    Step-by-step explanation:

    x^2 + 2 = 3^2/3 + 3^-2/3

    x^2 = 3^2/3 + 3^-2/3 - 2

    x = √ (3^2/3 + 3^-2/3 - 2)

    x = 0.748888296

    Substitute for x in 3x^3 + 9x - 8:

    3 (0.748888296) ^3 + 9 (0.748888296) - 8 = 0.

    So it is proved.
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