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Math Help - Rearrange make subject

  1. #1
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    Rearrange make subject

    Rearrange to make M the subject
    1/M = 1/M1 + 1/M2
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  2. #2
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    Smile


     <br />
\frac{1}{m}=\frac{m_{2}+m_{1}}{m_{1}m_{2}}<br />
     <br />
m=\frac{m_{1}m_{2}}{m_{2}+m_{1}}<br />
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  3. #3
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    Hello Thank you for your reply
    Can you explain to me why it is arranged like that please?
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  4. #4
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    Smile

    \frac{1}{m}=\frac{1}{m_{1}}+\frac{1}{m_{2}}=\frac{  m_{2}}{m_{1}m_{2}}+\frac{m_{1}}{m_{2}m_{1}}
    you have the same denominator,
    \frac{1}{m} = \frac{1}{m_{1}}+\frac{1}{m_{2}}=\frac{m_{2}+m_{1}}  {m_{2}m_{1}}
    to find m just flip the fraction,
    m=\frac{m_{2}m_{1}}{m_{2}+m_{1}}
    hope it helps.
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  5. #5
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    Hello

    Thanks


    Quote Originally Posted by Raoh View Post
    \frac{1}{m}=\frac{1}{m_{1}}+\frac{1}{m_{2}}=\frac{  m_{2}}{m_{1}m_{2}}+\frac{m_{1}}{m_{2}m_{1}}
    you have the same denominator,
    \frac{1}{m} = \frac{1}{m_{1}}+\frac{1}{m_{2}}=\frac{m_{2}+m_{1}}  {m_{2}m_{1}}
    to find m just flip the fraction,
    m=\frac{m_{2}m_{1}}{m_{2}+m_{1}}
    hope it helps.
    Last edited by wolfhound; December 4th 2009 at 01:54 PM. Reason: understand
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