Quadratic Exploration

Slide the values of a, b and c to see what happens to the parabola. The vertex is the purple point on the curve. Come up with a definition of the vertex of a parabola. The location of the vertex is also given. Can you find a formula for the x coordinate of the vertex based on the values of a, b and c?

The graph of the quadratic function y=ax^2+bx+c