TI-85/86

Graph: y=x²-16

GRAPH, F1 y(x)=, x-VAR x² - 1 6 EXIT F5 GRAPH

Zoom In:

F3 ZOOM, F2 Z IN. Move the cursor to where you want to zoom in, and ENTER.

Zoom Box:

F3 ZOOM, F1 BOX. 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.

Zoom Decimal:

F3 ZOOM, MORE, F4 ZDECM. This resets the x-axis so that when you trace on the graph, the x-variable will increase in increments of 0.1.

Zoom Standard:

Use F3 ZOOM, F4 ZSTD to return to the standard viewing rectangle.

Trace:

Use F4 TRACE and ◄ ► to trace points on the graph. If you are graphing more than one equation, ▲ ▼will move you from graph to graph.

Window:

Use F2 RANGE on the TI-85, and F2 WIND on the TI-86 to alter the viewing rectangle to specific parameters.

Table (TI-86 only):

Use TABLE F1 to view points on the graph stored in the table. Use F1 TBLST to set the starting x-value in the table (TblStart) and the gap between x-values in the table (ΔTbl).

Evaluate:

To evaluate the equation being graphed for a specific value of x, use GRAPH, MORE twice, and then F1 EVAL. Enter a value for x, and ENTER.

x-intercepts: To find the x-intercepts (roots or zeros) of an equation being graphed:

TI-85: GRAPH, MORE, F1 Math, and F3 ROOT. Position the cursor near the root, and ENTER.

TI-86: GRAPH, MORE, F1 Math, and F1 ROOT. You will be asked for a lower (left)

x-bound, and an upper (right) x-bound, and a guess. Mover the cursor to the appropriate places and ENTER after each step.

Maximum/Minimum Values:

TI-85: GRAPH, MORE, F1 Math, MORE, and F1 or F2. Position the cursor near the maximum or minimum part of the graph, and ENTER. You may have to zoom in on that part of the graph first.

TI-86: GRAPH, MORE, F1 Math, and F4 or F5. You will be asked for a lower (left) x-bound, and an upper (right) x-bound, and a guess. Mover the cursor to the appropriate places and ENTER after each step.

Mark Wilson

Instructor-SJRCC

Revised 1/06