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Math Help - Change of subject problem.

  1. #1
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    Change of subject problem.

    Solve R = 1 / (1/R1+1/R2) For R1

    Can someone please describe in detail how this is done.

    I first added the bottom fractions and next I figure that the right hand side has to be inverted but I'm not sure how that should be done.

    Any help is appreciated.
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  2. #2
    Senior Member
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    Re: Change of subject problem.

    Note that 1/(a/b) = b/a (ie the reciprocal of a/b is b/a) use that on the RHS to get R1R2/(R1+R2)
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