Move the sliders, or focus one and use the arrow keys. The grid runs from −10 to 10. Switch between standard form (a, b, c) and vertex form (a, h, k): the parabola stays where it is, only the controls change.
Your job
Tap a graph, then tap the equation that matches it (or the other way round). Each graph has a 1-unit grid from −6 to 6, and the vertex is marked with a dot. Every card is a button, so Tab and Enter work too.
Fictional people and practice numbers to learn the math.
Wrong picks are fine here. Each one tells you why.