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the set of all points in a plane that are the same distance from a given point, called the focus, and a given line, called the directrix
the solutions of a quadratic equation of the form ax²+bx+c=0, where a≠0, are given by the quadratic formula, which is -b±√b²-4ac all over 2a
1. the point at which the axis of symmetry intersects a parabola
2. the point on each branch nearest the center of a hyperbola
zero product property
for any real numbers a and b, if ab=0, then either a=0, b=0, or both a and b equal zero
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