Parabola is a graph of an univariate quadratic function. This function can be written in three forms:

• standard form: y = a·x² + b·x + c
• vertex form: y = a·(x-p)² + q
• factored form: y = a·(x-r1)·(x-r2)

With the vertex form, we can easily read the vertex of the parabola (p,q).
With the standard form, this requires some calculations.

This app demonstrates how parameters p,q and a,b,c are changing when we move the vertex of parabola step by step.