HP 39g+ - Manual (Page 24)

1-14 Getting started
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.
Quad Explorer
aplet The Quad Explorer aplet is used to investigate the
behaviour of
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.
y a x h + ( )
2
v + =