This document discusses quadratic functions and their graphs. It defines a quadratic function as having the form y = ax2 + bx + c. The graph of a quadratic function is a parabola, which has a vertex (lowest or highest point) and an axis of symmetry (vertical line through the vertex). It provides examples of graphing different quadratic functions using a graphing calculator and by hand, including how to find and plot the vertex and axis of symmetry.