# Homework Help: Trying to solve for R

1. Oct 24, 2011

### zgozvrm

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):

$$R - \sqrt{R^2 - X^2} \le B - \sqrt{B^2 - \left( \frac{BX}{A} \right) ^2}$$

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. Oct 24, 2011

### arildno

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.

3. Oct 24, 2011

### zgozvrm

Yeah, thanks. I just drew a blank for some reason!