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Homework Help: Trying to solve for R

  1. Oct 24, 2011 #1
    1. The problem statement, all variables and given/known data

    This is not homework; I'm working on a problem of my own...

    I can't seem to remember how to solve equations like this (I'm trying to solve for R):

    [tex]R - \sqrt{R^2 - X^2} \le B - \sqrt{B^2 - \left( \frac{BX}{A} \right) ^2}[/tex]

    2. Relevant equations

    My initial thought was to square both sides, but I don't see how that would help.

    3. The attempt at a solution

    I don't really know where to start.
  2. jcsd
  3. Oct 24, 2011 #2


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    Science Advisor
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    Gold Member
    Dearly Missed

    You need to get rid of the square root expression containing R^2.
    Move your single R over to the other side, and THEN square both sides.

    You'll need to be careful when specifying the domain of solutions.
  4. Oct 24, 2011 #3
    Yeah, thanks. I just drew a blank for some reason!
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