HP Prime Graphing Calculator - Manual (Page 305)

The Explorer apps 301
Choose a general form by tapping the Level
button—
, and so on—until the form you
want is displayed. The keys available to you to manipulate
the graph vary from level to level.
Equation mode Tap to move to
equation mode. In
equation mode, you use
the cursor keys to move
between parameters in
the equation and change
their values, observing
the effect on the graph
displayed. Press
\ or = to decrease or increase the
value of the selected parameter. Press > or < to select
another parameter. Press Q to change the sign. You
have four forms (or levels) of graph, and the keys available
for manipulating the equation depend on the level chosen.
Test mode Tap to enter test
mode. In Test mode you
test your skill at matching
an equation to the graph
shown. Test mode is like
equation mode in that you
use the cursor keys to
select and change the value of each parameter in the
equation. The goal is to try to match the graph that is
shown.
The app displays the graph of a randomly chosen
quadratic function. Tap the Level button to choose
between one of four forms of quadratic equation. You can
also choose graphs that are relatively easy to match or
graphs that are harder match (by tapping
or
respectively).
Now press the cursor keys to select a parameter and set
its value. When you are ready, tap
to see if you
have correctly matched your equation to the given graph.