In this video, starting with a point (focus) and a line below the point (directrix), Sal tries to find the set of all points (locus) central to the point and the line. Using the distance formula, he shows that we have a parabola equation.

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