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Math Help - Making a pronumeral the subject

  1. #1
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    Making a pronumeral the subject

    Can someone please solve Rp=R1 R2/R1+R2 to make R the subject!

    And for a bunus C=N-n/2p to make p the subject.

    Thanks so much!!
    Last edited by mr fantastic; January 14th 2010 at 03:34 AM. Reason: Changed post title
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  2. #2
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    Quote Originally Posted by JKDste View Post
    Can someone please solve Rp=R1 R2/R1+R2 to make R the subject!

    And for a bunus C=N-n/2p to make p the subject.

    Thanks so much!!
    Please either use brackets in the correct places, or use LaTeX.


    Is the first one

    R_p = \frac{R_1R_2}{R_1 + R_2}?


    Is the second

    C = \frac{N - n}{2p}?
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  3. #3
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    Yeah thats it! Sorry I didn't know how to type it out like that!

    Thanks so much!
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  4. #4
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    Your first question doesn't make sense, since you don't have R as a variable.

    Are you trying to make R_1 or R_2 the subject?


    Q.2) C = \frac{N - n}{2p}

    2Cp = N - n

    p = \frac{N - n}{2C}.
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  5. #5
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    Quote Originally Posted by Prove It View Post
    Your first question doesn't make sense, since you don't have R as a variable.

    Are you trying to make R_1 or R_2 the subject?


    Q.2) C = \frac{N - n}{2p}

    2Cp = N - n

    p = \frac{N - n}{2C}.

    Thanks Prove it, the subject for the other one was R1
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  6. #6
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    R_p = \frac{R_1R_2}{R_1 + R_2}

    R_p(R_1 + R_2) = R_1R_2

    R_1R_p + R_2R_p = R_1R_2

    R_1R_p - R_1R_2 = -R_2R_p

    R_1(R_p - R_2) = -R_2R_p

    R_1 = -\frac{R_2R_p}{R_p - R_2}

    R_1 = \frac{R_2R_p}{R_2 - R_p}.
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