| # Quadratic functions in two variables Symmetric Matrices > Definitions > Example Two examples of quadratic function are , with values The function is a form, since it has no linear or constant terms in it.
| Level sets and graph of the quadratic function . The epigraph is anything that extends above the graph in the -axis direction. This function is ‘‘bowl-shaped’’, or convex.
| Level sets and graph of the quadratic function . This quadratic function is not convex.