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Math Help - Quadratic equations

  1. #1
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    Quadratic equations

    I'm stuck on a few problems and was hoping I could get some help.

    x^2=4-2x

    the answer key says x=-1 plus or minus √5 but I have not been able to come to this.

    Also,

    2x^(2/3)-5x^(1/3)=3
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  2. #2
    Member anonimnystefy's Avatar
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    Re: Quadratic equations

    hi drewm

    for the first one,move all of the terms to one side.then use the quadratic formula to get x.

    for the second one use the substitution t=x^(1/3),then move all of the terms to one side,use the quadratic formula to get t and calculate x from t.
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  3. #3
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    Re: Quadratic equations

    I am kind of stuck on the second one, mainly factoring this:

    2u^2-5u-3=0 ?
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  4. #4
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    e^(i*pi)'s Avatar
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    Re: Quadratic equations

    Trial and error leads us to (2u + 1)(u-3)
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