Texas Instruments TITANIUM TI-89 - Manual (Page 339)

Basic Function Graphing 339
6. Set the lower bound for x. Either use A and B to move the cursor to the lower bound
or type its x value.
Note: If you do not press A or B, or type an x value when setting the lower and
upper bound, xmin and xmax will be used as the lower and upper bound,
respectively.
7. Press ¸. A 4 at the top of the screen marks the lower bound.
8. Set the upper bound, and press ¸.
The bounded area is shaded. To erase
the shaded area, press
† (
ReGraph ).
Below
function
Above
function