By now you should all have a good understanding of the role of the parameters (\(a\), \(b\), and \(c\)) in a quadratic function expressed in standard form: $$y=ax^2 +bx+c, \text{ where } a \neq 0$$
You can use the Quadratic Function Explorer (yes, it works on your iPad too!) to see how changing these parameters affects the graph of the function.