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How to rearrange the equation?

  1. Mar 24, 2010 #1
    I've been trying (unsuccessfully!) to rearrange the following equation so that H is the subject:

    mgH = [k(H - L)^2] / 2

    (Where ^2 means squared.) I also have some test data which shows that if m = 50, g = 9.8, k = 40 and L = 20, H should equal 57.5, or thereabouts
  2. jcsd
  3. Mar 24, 2010 #2


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    Homework Helper

    If you expand the square term, move the left side over to the right, collect terms, you get a quadratic equation in H that you can solve.
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