How Can I Make H the Subject in This Equation?

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SUMMARY

The equation mgH = [k(H - L)^2] / 2 can be rearranged to make H the subject by expanding the square term and forming a quadratic equation. Given the parameters m = 50, g = 9.8, k = 40, and L = 20, the solution for H approximates to 57.5. The process involves moving terms to one side and collecting like terms to facilitate solving the quadratic equation. This method is essential for isolating variables in physics-related calculations.

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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
 
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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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