3. Focus of a Parabola
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The graph of a quadratic function is a parabola that opens up or down. What other definition of parabola do you know?
See solution.
We already know that the graph of a quadratic function is a parabola that opens up or down. The focus of a parabola is a point that is used in a second definition. A parabola can also be defined as the set of all the points in the plane that are equidistant from a fixed point called the focus, and a fixed line called the directrix.
