We've already learned that parabolas are the graphs of quadratic functions, but now we are going to learn the definition and the features of the parabola. A parabola is the set of points in the plane whose distance from a given point, called the focus, is equal to its distance from a given line, called the directrix. The axis of symmetry of a parabola passes through the focus and is perpendicular to the directrix. The vertex of a parabola is the point at which the axis of symmetry intersects the parabola. The vertex is the maximum or minimum point on the parabola. In this lecture you'll also learn about different forms of parabola, about graphing, and different properties of parabolas.
*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.