Texas Instruments TI-92 Getting Started page 16

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Graphing Technology Guide: TI-92

(Figure 5.45). (Note that you can use the diagonal directions on the cursor pad for this.) If this box looks all right to

you, press ENTER. The rectangular area you have enclosed will now enlarge to fill the graph window (Figure 5.46).

Figure 5.43: F2[Zoom] menu

Figure 5.44: One corner selected

You may cancel the zoom any time before you press this last ENTER. Press F2[Zoom] once more and start over.

Press ESC or

GRAPH to cancel the zoom, or press 2nd QUIT to cancel the zoom and return to the Home

screen.

Figure 5.45: Box drawn

Figure 5.46: New viewing rectangle

You can also quickly magnify a graph around the cursor's location. Return once more to the standard window for

the graph of the two functions y = –x

+ 4x and y = –.25x . Press F2[Zoom] 2[Zoomln] and then use the cursor pad

to move the cursor as close as you can to the point of intersection near x = 2 (see Figure 5.47). Then press ENTER

and the calculator draws a magnified graph, centered at the cursor's position (Figure 5.48). The range variables are

changed to reflect this new viewing rectangle. Look in the WINDOW menu to verify this.

Figure 5.47: Before a zoom in

Figure 5.48: After a zoom in

As you see in the F2[Zoom] menu (Figure 5.43), the TI-92 can zoom in (press F2[Zoom] 2) or zoom out (press

F2[Zoom] 3). Zoom out to see a larger view of the graph, centered at the cursor position. You can change the

horizontal and vertical scale of the magnification by pressing F2[Zoom] C[SetFactors] (see Figure 5.49) and

editing xFact and yFact, the horizontal and vertical magnification factors. (The zFact is only used when dealing

with 3-dimensional graphs.)