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Solve for x: x^4-15X^2+14=0

How would I solve this problem?

  • Math -

    (x^2-1)(x^2-14) = 0,

    x^2-1 = 0,
    x^2 = 1,
    X = +-1.

    x^2-14 = 0,
    x^2 = 14,
    X = +-sqrt14.

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