Texas Instruments TI-83 PLUS - Manual (Page 151)

TI-83 Plus Function Graphing 148
To evaluate a selected function at X , follow these steps.
1. Select 1:value from the
CALCULATE
menu. The graph is displayed with
X= in the bottom-left corner.
2. Enter a real value, which can be an expression, for X between Xmin
and Xmax .
3. Press Í .
The cursor is on the first selected function in the Y= editor at the X value
you entered, and the coordinates are displayed, even if CoordOff format
is selected.
To move the cursor from function to function at the entered X value,
press } or † . To restore the free-moving cursor, press | or ~ .
zero
zero finds a zero (x-intercept or root) of a function using solve( . Functions
can have more than one x-intercept value; zero finds the zero closest to
your guess.