Chapter 17: Activities 304
Zooming In on the Graph
To help identify maximums, minimums, roots, and intersections of functions, you can magnify the
viewing window at a specific location using the
ZOOM instructions.
7. Press Í.
The trace cursor jumps to the point on
the
Y1 function evaluated at X=3.8.
8. Press | and ~ until you are on the
maximum
Y value.
This is the maximum of
Y1(X) for the X
pixel values. The actual, precise
maximum may lie between pixel values.
1. Press q to display the
ZOOM menu.
This menu is a typical TI-84 Plus menu.
To select an item, you can either press
the number or letter next to the item, or
you can press † until the item number or
letter is highlighted, and then press
Í.
2. Press
2 to select 2:Zoom In.
The graph is displayed again. The cursor
has changed to indicate that you are
using a
ZOOM instruction.
3. With the cursor near the maximum value
of the function, press Í.
The new viewing window is displayed.
Both
XmaxNXmin and YmaxNYmin have
been adjusted by factors of 4, the default
values for the zoom factors.
4. Press |
and ~ to search for the
maximum value.
5. Press p to display the new window
settings.
Note: To return to the previous graph,
press q
~ 1:ZPrevious.
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