Move the sliders of a, b and c and realise what effect changing each of these values have on the graph of the quadratic equation.

Q1. What does changing the value of a, do to the graph?
Q2. How is the graph when a is less than 0 different from when a is greater that 0?
Q3. What does changing the value of b do to the graph?
Q4. Is there any link/connection between the tangent at the y-intercpet and the value of b?
Q5. What does changing the value of c do to the graph?