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Natural logarithm question

  1. Mar 15, 2013 #1
    1. The problem statement, all variables and given/known data

    I've been puzzling with this for 1 hour and can't figure it out. How do you calculate the unknown x from this equation?

    2. Relevant equations

    ln(1-x)-5x+7.5=0
     
  2. jcsd
  3. Mar 15, 2013 #2

    HallsofIvy

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    Staff Emeritus
    Science Advisor

    Since this involves the variable, x, both inside a transcendental function and outside it, there is no "algebraic" method to solve for x. You will have to use a numerical method.
     
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