SOLUTION: Solve for R: 2(pi)R^2 + 2(pi)RH - S = 0 I have the answer in the textbook, but I can't seem to find how it was derived. I used the Quadratic Formula but the process got all c

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Question 1204132: Solve for R:
2(pi)R^2 + 2(pi)RH - S = 0
I have the answer in the textbook, but I can't seem to find how it was derived. I used the Quadratic Formula but the process got all convoluted and I kept getting the wrong answer.
Thank you!

Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!

Solve for :







....complete square=>=>









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