It’s important to keep them in mind when trying to figure out How to find focus and directrix.
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Two plus -1 is one, so one, and so what is this going to be? You're gonna get y is equal to 1/6, x minus one, squared, plus 1/2. There you go. That is the parabola with a focus at (1,2) and a directrix at y equals -1. Fascinating. Creative Commons Attribution/Non-Commercial/Share-Alike
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