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Homework Help: Nanoparticle Algebra

  1. Jul 26, 2007 #1
    1. The problem statement, all variables and given/known data


    Solve for R.

    2. Relevant equations

    Algebra, come to bite me in the butt...

    3. The attempt at a solution




    And I'm stuck...
    Properly, this isn't a homework question at all; I'm trying to analyze experimental data and I'd rather not call my prof with an algebra question :redface:
  2. jcsd
  3. Jul 26, 2007 #2
    No longer *need* an answer. My professor told me to plot the data in excel and solve graphically. But I'd still like to know if it's possible to isolate R.
  4. Jul 26, 2007 #3
    It's certainly possible. Find the common denominator for the fractional parts and make cubic polynomial in R, and find the 3 roots. One is guaranteed to be real, the other two may be complex conjugates or real (can't tell just by looking at it).
  5. Jul 26, 2007 #4



    But how to factor this beastie?
  6. Jul 26, 2007 #5
  7. Jul 26, 2007 #6
    :yuck: Thank you... Uhuhurgh. Maybe I'll give it a shot, though it does make me look a lot more kindly on my professor's approach of just graphing N versus R and seeing where our values of N lie on the curve.
    Last edited: Jul 27, 2007
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