Starting with a point (focus) and a line below the point (directrix), in this video, Sal tries to find the set of all points (locus) equidistant to the point and the line. He shows, using the distance formula, that indeed, we have an equation of a parabola.

Concepts

parabolas, graphing quadratics

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Additional Tags

directrix, parabola, graphs of parabola, math

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Classroom Considerations

• This video is hosted on YouTube