SOLUTION: Hello! I need help on this problem: 1/R= 1/R (subscript of 1) + 1/R (subscript of 2) solve for R (subscript of 2) Thanks in advance! Kevin

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Question 212960: Hello! I need help on this problem:
1/R= 1/R (subscript of 1) + 1/R (subscript of 2)
solve for R (subscript of 2)
Thanks in advance!
Kevin
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Kevin, I already answered this problem,
See my answer # 160872.
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Oops! My error, I did not see the subscript of 2.
Let's try again.
1%2FR+=+1%2FR%5B1%5D+%2B+1%2FR%5B2%5D
Solve for R%5B2%5D:
1%2FR+=+1%2FR%5B1%5D%2B1%2FR%5B2%5D} Subtract 1%2FR%5B1%5D from both sides.
1%2FR+-+1%2FR%5B1%5D+=+1%2FR%5B2%5D Simplify the left side.
%28R%5B1%5D-R%29%2F%28R%2AR%5B1%5D%29+=+1%2FR%5B2%5D Invert both sides.
R%2AR%5B1%5D%2F%28R%5B1%5D-R%29+=+R%5B2%5D
highlight%28R%5B2%5D+=+R%2AR%5B1%5D%2F%28R%5B1%5D-R%29%29