In this video we learn to find the minimum or maximum values of quadratic functions. If a parabola points up (like a letter u) the minimum is at the vertex. If a parabola points down (like an upside down) the maximum is at the vertex.
How to: Graph a quadratic function using its roots and vertices. More free lessons at: http://www.khanacademy.org/video?v=eF6zYNzlZKQ Note: All Khan Academy content is available for free at (www.khanacademy.org)