Parabola Focus and Directrix Part 1
By Salman Khan - Khan Academy
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Lecture Description
Parabola as the locus of all points equidistant from a point and a line.
Course Description
Topics covered from very basic algebra all the way through algebra II. This is the best algebra playlist to start at if you've never seen algebra before. Once you get your feet wet, you may want to try some of the videos in the "Algebra I Worked Examples" playlist.
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