SOLUTION: hi my problem is this. 1/f=1/s+1/r (solve for s) please show all steps so i can understand how to work similar problems

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Question 11848: hi my problem is this. 1/f=1/s+1/r (solve for s) please show all steps so i
can understand how to work similar problems

Answer by rapaljer(4671)   (Show Source): You can put this solution on YOUR website!


Begin by finding the LCD for the entire problem, which is fsr.

Multiply both sides of the equation by fsr:


In the first fraction, the f divides out,
in the second, the s divides out, and
in the third fraction, the r divides out.

What is left will be:


You are solving for s, so get the s terms all on the left side by subtracting fs from each side:



Get the s in one place by factoring out the s:


Last, divide both sides by (r-f):



Final answer:


R^2 at SCC

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