HP 39gs Quick Start Manual page 53

Explorer Aplet starts in the Plot view.
Table 1- 1 2 Quadratic Explorer Aplet Summary
Summary of Functionality
Press PLOT (or the GRPH menu key) to return to this view at any time. In this view, you can
translate and dilate the graph directly and see the resulting effects on the values of the
equation parameters as you manipulate the graph. The equation of the current graph is
displayed, along with the value of the discriminant and the root or roots (if any). The
commands are:
Use the cursor movement keys to translate the graph
•
• Use the + and - keys to dilate the graph
• Use the (-) key to reflect the graph over the x-axis
In addition to the functionality above, the menu has the following additional features:
• SYMB: switches to the Symbolic view
• GRPH: switches to Plot view
• INC1: a toggle that controls the size of each translation or dilation step. The choices are
0.5, 1, and 2.
• LEVEL toggle among various forms of quadratic functions. The choices are:
2
• y=a(x+h) +v (the default)
2
• y=ax
2
• y=(x+h)
2
• y=x +v
• TEST: enters test mode
• RESET: resets the Aplet
View Name and Display
Quadratic Explorer Aplet
Getting Started 47