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Math Help - solve for x

  1. #1
    Junior Member
    Joined
    Jul 2007
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    72

    solve for x

    I am trying to solve this equation and find x
    The equation is:
    e^(-2x)-7e^(-x)=8
    I tried multiplying everything by e^(x), but that didnt seem to help
    I got e^(x)-7=8e^(x)
    That can be simplified as -7 = 7e^(x)
    at this point there is not value for x that would work.
    Help??
    Thanks once again.
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  2. #2
    MHF Contributor red_dog's Avatar
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    Medgidia, Romania
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    Note e^{-x}=y and you get y^2-7y=8
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