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Thread: Help with reversing an equation

  1. January 24th 2009, 07:51 AM #1
    lrn_math
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    Help with reversing an equation

    Hello,

    I need some help with the following equation:


    n * (( n / 2 ) + 0.5) = TN

    Thus:

    15 * (( 7.5 ) + 0.5 ) = 120

    I would like to be able to have TN and solve for n. I couldn't figure out a way to reverse the equation or isolate n.

    Can anyone help me with this please?
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  2. January 24th 2009, 09:19 AM #2
    Plato
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    \begin{gathered}<br /> n\left( {.5n + .5} \right) = T \hfill \\<br /> n^2 + n - 2T = 0 \hfill \\<br /> n = \frac{{ - 1 + \sqrt {1 + 8T} }}<br /> {2} \hfill \\ <br /> \end{gathered}
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  3. January 25th 2009, 10:47 AM #3
    lrn_math
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