SOLUTION: solve for r: S= rL-a/r-1

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Question 565494: solve for r:
S= rL-a/r-1
Answer by ad_alta(240) About Me  (Show Source):
You can put this solution on YOUR website!
This is really quite messy, so I can't type out all the work. r=[(s+1) {+/-} sqrt(s^2+2s+4aL+1)]/2L.
The {+/-} indicates plus or minus. I suggest you work backward from this to wherever you were stuck. Good luck!