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Thread: Rearranging formula help

  1. November 7th 2008, 08:34 AM #1
    natali.ferno
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    Rearranging formula help

    hi ,

    need some rearranging this formula

    \frac{1}{r} = \frac{1}{q} + \frac{1}{d}

    IF I want to make r the subject of the formula, how would i go about this?
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  2. November 7th 2008, 08:40 AM #2
    Moo
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    Hello,
    Quote Originally Posted by natali.ferno View Post
    hi ,

    need some rearranging this formula

    \frac{1}{r} = \frac{1}{q} + \frac{1}{d}

    IF I want to make r the subject of the formula, how would i go about this?
    \frac 1q+\frac 1d=\frac{d+q}{qd}

    So \frac 1r=\frac{d+q}{qd}

    taking the inverse on both sides :

    r=\frac{qd}{q+d}
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