Finding a numerical derivative on the TI84 is quite simple.
It is also possible to graph the derivative of a function on the
TI84 without actually finding the algebraic representation for the derivative.

Homescreen Method 

Directions 
Older OS for TI & TI84 
New Operating System for TI84 Plus (ver. 2.53 and above) 
Select Math:8. nDeriv( 


This will paste the command line on your homescreen. 


Following the parentheses, you need to type the equation for
which you want the derivative. 


Follow this with a comma, the variable x (since this is the
variable in the function, another comma, and the number at which you want
the numerical derivative. Close this command line with a closed
parentheses. 

Press enter and this command line is executed and the
numerical answer is printed on the screen 






First type in the equation in a function slot for which you
want to find the numerical derivative. 

Graph the equation in an appropriate window. 

Press 2nd CALC and select choice 6: dy/dx 

Use the cursor arrows to move you to the location or simply
type in the x value on the screen. 

Press ENTER. The screen indicates that the
derivative of this function at x = 1 is 2. 

