Move the slider to change the coefficient of x squared.[br]You can see the effect of this by comparing the blue graph to the graph of x squared which is red.[br]Use the buttons to show the table and to turn "Trace On" - you will then see copies of the graph as you move the slider.

Examine the values of a times x squared in the table as you move the slider. A common mistake is to multiply [i]x[/i] by a first and then square - be careful.