In this lesson on Parabolas 9, the instructor teaches how to graph the function f(x) = -2x^2 + 6x and find the axis of symmetry and vertex point. The formula x = -b/2a is used to find the axis of symmetry which is x = 3/2, and plugging this value back into the function gives the vertex point of (3/2, 9/2). The lesson emphasizes the importance of simplifying fractions and provides alternative ways to express the vertex point.
Graphing Parabolas Part 9;
More free YouTube videos by Julie Harland are organized at http://yourmathgal.com