Quadratic Explorer App - HP 39gII User Manual

Test mode

Quadratic Explorer app

148
see one of the parameters in the equation highlighted. In
Equation mode, you change the values of one or more of
the parameters in the equation and those changes are
reflected in the graph. Press
decrease the value of the selected parameter,
respectively. Press
parameter. Press
-
Press (F5) to enter
Test mode. In Test mode, the
app displays the graph of a
randomly chosen linear
function of the form dictated
by your choice of level.
Press (F3) to choose between direct variation (LEV
1) and slope-intercept (LEV 2) forms of linear functions.
Test mode then works like Equation mode. Use the arrow
keys to select each parameter and set its value. When
you are ready, press
you have correctly matched your equation to the given
graph. Press
(F6) to exit Test mode and return to Graph mode.
The Quadratic Explorer app is used to investigate the
behaviour of
y =
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.
I
Press , select
Quadratic Explorer,
and then press
Quadratic Explorer app
opens in mode, in
which the arrow keys, the
-
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.
\ =
and
> <
and to select another
to change the sign of a.
(F4) to see whether or not
(F5) to see the correct answer. Press
2
as the values of a, h and
( )
a x + h + v
. The
+
and
to increase or
w
keys, and
The Explorer Apps