I was in math class the other day. We are currently covering the equation of a parabola given a directrix. I think I might have found an equation in vertex form (\(f(x)=a(x-h)^2+k\), where h = x-value f vertex and k = y-value of vertex) given the coordinates of the focus as \((b,\ d)\) and the directrix as \(y=c\).


Is this correct? Because I tried it in 2 different scenarios, and it worked both times.

 Feb 1, 2018

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