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Thread: using quadratic formula to find irrational roots

  1. June 9th 2010, 10:54 PM #1
    alessandromangione
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    using quadratic formula to find irrational roots

    given x^4-5x^2+4...how can i use the quadratic formula to find irrational roots? i know that i need to transform x^4...but i don't know how...
    thanks
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  2. June 9th 2010, 11:20 PM #2
    undefined
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    Quote Originally Posted by alessandromangione View Post
    given x^4-5x^2+4...how can i use the quadratic formula to find irrational roots? i know that i need to transform x^4...but i don't know how...
    thanks
    x^4-5x^2+4=0

    Let y=x^2

    So y^2-5y+4=0

    Solve for y, then go back and find x.
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