How to use the geometric sketchpad to make a quadratic function diagram Quadratic function is a mathematical model to describe the law of movement change in the objective world, and it is an important mathematical concept based on change and correspondence. In order to make students understand the interdependence between variables of quadratic function and clearly see the translation and symmetry among several forms of quadratic function, such as y=ax2, y=ax2+k, Y = (X-H) 2, Y = A (X-H) 2+K, y=ax2+bx+c, it is necessary to provide students with a lot of image materials. Of course, it is best to let them intuitively watch how the graph changes when several parameters A, B, C or parameters H and K in the function change, and see the corresponding relationship of variables in the process of motion change.