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    jacob_devereaux's Avatar
    jacob_devereaux Posts: 1, Reputation: 1
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    #1

    Jun 3, 2010, 03:28 PM
    Factorising
    Factor Completely: X^4-2x^2-8
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Jun 4, 2010, 09:09 AM

    Treat your expression as a quadratic one. You can replace x^2 by y for example.

    Let

    Then,



    Then, replace your x.



    It's nearly done. Can you complete it?

    Hint, remember that:
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