Quadratic curves in completing the square format

What is point A known as?

By changing the values of h and k on the sliders, how does it impact the quadratic curve?

Does the curve always touch the x-axis?

When we change the value of a on the slider, what are the impacts on the quadratic curve? Record your observations.

State the key features that we can identify from the quadratic curves when it is expressed in (1) general form, (2) factorised form and (3) complete the square form?