TI-89

Note: If you are on the desktop screen and not the Home screen, select the Home icon and ENTER.

 

Graph: y=x2-16

                       

 

F1 (y1=), X    ^    2    –    1    6   ENTER 

 

 


F3 GRAPH

 

 

Zoom In:

 F2 2:  Move the cursor to where you want to zoom in and ENTER.

 

Zoom Box:

 F2 1:  Move the cursor to any corner of the box that you want to define and ENTER. Then move the cursor to the opposite diagonal corner of the box that you want to define and ENTER again.

 

Zoom Decimal:

 F2 4:  This resets the x-axis so that when you trace on the graph, the x-variable will go up in increments of 0.1.

 

Zoom Standard:

 F2 6:  This returns you to the standard viewing rectangle.

 

Trace:

Use F3 and ◄ and ► to trace points on the graph. If you are graphing more than one equation, ▲ and ▼ will move you from graph to graph.

 

Window:

 

 


F2 WINDOW. Alter the viewing rectangle to specific parameters and then

           

F3 GRAPH.

 

Table:

 

 


F5 TABLE to view points on the graph kept in the table. Use F2 Setup to set the starting x-value used in the table (tblStart) and the gap between x-values in the table (Δtbl).

 

 

 

Evaluate:

With the graph displayed, to evaluate the equation being graphed for a specific value of x, use F5 and then 1: Value. Type in a value for x and ENTER.

 

x-intercepts:

To find the x-intercepts (roots or zeros) of an equation, use F5 and then 2:. You will be asked for a lower (left) x-bound, and an upper (right) x-bound. Move the cursor to the appropriate places and ENTER after each step.

 

Maximum/Minimum Values:

To find a maximum or minimum value of the function use F5 and then 3: or 4:. You will be asked for a lower (left) x-bound, and an upper (right) x-bound. Move the cursor to the appropriate places and ENTER after each step.

 

 

 

Miscellaneous

 

  1. To adjust the contrast, press and hold both

 and  +  (darker) or                   and  –  (lighter).

 

 

      2. To obtain the decimal form of an answer, use

                        example: 13/2               ENTER → 6.5

 

  1. To clear the entries on the Home screen, use F1 8: Clear Home.
  2. To access something in the catalog, use CATALOG, and then press the key corresponding to the first letter in the item that you are looking for. (The letters are in purple over the keys.) Then use ▼ to scroll down.

 

 

 

 

Mark Wilson

Instructor-SJRCC

Revised 1/06