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

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


   

Question 212936: Hello! I need help on this problem:
1/R= 1/R (subscript of 1) + 1/R (subscript of 2)
solve for R
Thanks in advance!
Kevin
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Solve for R:
1%2FR+=+1%2FR%5B1%5D%2B1%2FR%5B2%5D To get the two fractions on the left over a common denominator, multiply the first by R%5B2%5D%2FR%5B2%5D and the second by R%5B1%5D%2FR%5B1%5D
Simplify the right side.
1%2FR+=+%28R%5B1%5D%2BR%5B2%5D%29%2F%28R%5B1%5D%2AR%5B2%5D%29 Now invert both sides.
highlight%28R+=+%28R%5B1%5D%2AR%5B2%5D%29%2F%28R%5B1%5D%2BR%5B2%5D%29%29