How To Find A Parabolas Equation From Its Directrix And Focus. Because this parabola opens horizontally, we use the formula {eq} (h + p, k) {/eq} to find the focus. Hence, the equation of the parabola is x2 = 20y.

Figure b parabola cheat sheet for vertically oriented parabolas focus vertex axis of symmetry and directrix standard form teaching math. A parabola is the shape of the graph of a quadratic equation. The shape of the parabola is what you see when you buy an ice cream cone and snip it off parallel to the side of the cone.