Operation Manual

Chapter 17: Activities 303
Finding the Calculated Maximum
You can use a CALCULATE menu operation to calculate a local maximum of a function. To do this, pick
a point to the left of where you think the maximum is on the graph. This is called the left bound. Next,
pick a point to the right of the maximum. This is called the right bound. Finally, guess the maximum by
moving the cursor to a point between the left and right bounds. With this information, the maximum
can be calculated by the methods programmed in the TI-84 Plus C.
3. The graph is displayed again. The cursor
has changed to indicate that you are using
a
ZOOM instruction.
4. 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.
5. Press | and ~ to search for the maximum
value.
6. Press p to display the new window
settings.
Note: To return to the previous graph,
press q
~ 1:ZPrevious.
1. Press y / to display the
CALCULATE
menu. Press
4 to select 4:maximum.
The graph is displayed again with a
Left Bound? prompt.
2. Press | to trace along the curve to a point
to the left of the maximum, and then press
Í.
A 4 at the top of the screen indicates the
selected bound.
A
Right Bound? prompt is displayed.