HP 39g+ - Manual (Page 23)

Getting started 1-13
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.
When first started, the aplet is
in
BSQC—— 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
T`H7— displays a
sub-expression of your
equation (see right).
Pressing the
*A, and *>, key moves between sub-
expressions, while pressing the
*k, and *e, key changes
their values.
Pressing G@W@G— allows the user to select whether all three sub-
expressions will be explored at once or only one at a time.
A U@TU— button is provided to
evaluate the student’s
knowledge. Pressing
U@TU—
displays a target quadratic
graph. The student must
manipulate the equation’s parameters to make the equation
match the target graph. When a student feels that they have
correctly chosen the parameters a
8C@8F— button evaluates the
answer and provide feedback. An 6ITX— button is provided
for those who give up!
y a x h +
( ) 2
v + =