Question

Make the d subject of the formula c = kd^2 + e

Answer 1

`c = k {d}^(2) + e \\ = > c - e = k {d}^(2) \\ = > {d}^(2) = (c - e)/(k) \\ = > d = \sqrt{ (c - e)/(k) }`

Hope you could get an idea from here.

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