Vertex form of a parabola The vertex form of a parabola tells you—as you’d expect from the name—where the parabola’s vertex is. Vertex form of a parabola

    \begin{align*}y=a(x-h)^2+k\end{align*}

The coefficient a still tells you whether the parabola opens up or down, just like it does in the standard form. The constants h and k tell…

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