Texas Instruments PLUS TI-89 - Manual (Page 412)

Chapter 23: Activities 395
23ACTS.DOC TI-89/TI-92 Plus: Activities (English) Susan Gullord Revised: 02/23/01 1:24 PM Printed: 02/23/01 2:20 PM Page 395 of 26
6. Add the original function f(x) to
y3(x) and select the square
graphing style.
7. In the Window Editor, set the
window variables to:
x= [ ë 10,15,10]
y= [ ë 100,100,10]
8. Draw the graph.
Observe that the global behavior of the f(x) function is basically
represented by the quadratic quotient y2(x) . The rational expression
is basically a quadratic function as x gets very large in both the
positive and negative directions.
The lower graph is y3(x)=f(x) graphed separately using the line style.
Note: Be sure the Graph
mode is set to Function.