## Equation of a parabola from focus & directrix

y = a (x - h)2 + k And if the parabola opens horizontally (which can mean the open side of the U faces right or left), you'll use this equation: x = a (y - k)2 + h Because the example parabola opens vertically, let's use the first

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## Vertex Form

The implicit equation of a parabola is defined by an irreducible polynomial of degree two: such that or, equivalently, such that is the square of a linear polynomial . As a graph of a function [ edit] Parabolas
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