HP 39g Graphing Calculator - Manual (Page 25)

Quad Explorer
aplet
The Quad Explorer aplet is used to investigate the behaviour
of j = a(x + h) + 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.
i
■BHaassraraa™
• YsK'-a
: A,
■i- t 4-
V=K'B
DISCR 0
m=o
____ __________K2=<|_________
When first started, the aplet is
in ia,iia,i.S3 mode, in which the
arrow keys, the [T] and
keys and the |TT| 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 (see right).
i: : : :.- a '
ill .....^ t 4
T=K'-a
[ilSCR (I
______________ KB=0__________
Pressing the 0 and 0 key moves between sub­
expressions, while pressing the and Q key changes
their values.
Pressing R4*1=1 allows the user to select whether all three sub­
expressions will be explored at once or only one at a time.
A HSi button is provided to
evaluate the student’s
knowledge. Pressing HSl
displays a target quadratic
graph. The student must
Y=aC>l+h)2+u
Weil done !
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
button evaluates the
answer and provide feedback. An CliMffl button is provided
for those who give up!
Getting started 1-13