HP 39g+ Graphing manual Quad Explorer aplet

Quad Explorer aplet

A great many more teaching aplets can be found at HP’s web site and other web sites created by educators, together with accompanying documentation, often with student work sheets. These can be downloaded free of charge and transferred to the hp 39g+ using the separately supplied Connectivity Kit.

The Quad Explorer aplet is used to investigate the behaviour of y = a(x + h)2 + v as the values of a, h and v change, both by manipulating the equation and seeing the change in the graph, and by manipulating the graph and seeing the change in the equation.

H I N T More detailed documentation, and an accompanying student work sheet can be found at HP’s web site.

Press		, select Quad
Explorer, and then press
	. The Quad Explorer
aplet opens in
mode, in which the arrow
keys, the		and	keys,
and the		key are used to change the shape of the

graph. This changing shape is reflected in the equation displayed at the top right corner of the screen, while the original graph is retained for comparison. In this mode the graph controls the equation.

It is also possible to have the equation control the graph.

Pressing displays a sub-expression of your equation.

Pressing the and key moves between sub- expressions, while pressing the and key changes their values.

Pressing allows the user to select whether all three sub-expressions will be explored at once or only one at a time.

1-14 Getting started