Texas Instruments TI-82 STATS User Manual

Applications 17–11
82501F~1.DOC TI-83 international English Bob Fedorisko Revised: 10/26/05 1:49 PM Printed: 10/27/05 3:04
PM Page 11 of 20
Find the area of the region bounded by
f(x) = 300x / (x
2
+ 625)
g(x) = 3cos(
.1x)
x = 75
1. Press z. Select the default mode settings.
2. Press p. Set the viewing window.
Xmin=0 Ymin=L5
Xmax=100 Ymax=10
Xscl=10 Yscl=1
Xres=1
3. Press o. Turn off all functions and stat plots. Enter the
upper and lower functions.
Y1=300Xà(X
2
+625)
Y
2=3cos(.1X)
4. Press y [CALC] 5 to select 5:Intersect. The graph is
displayed. Select a first curve, second curve, and guess for
the intersection toward the left side of the display. The
solution is displayed, and the value of
X at the intersection,
which is the lower limit of the integral, is stored in
Ans and
X.
5. Press y [QUIT] to go to the home screen. Press y [DRAW]
7 and use Shade( to see the area graphically.
Shade(Y2,Y1,Ans,75)
6. Press y [QUIT] to return to the home screen. Enter the
expression to evaluate the integral for the shaded region.
fnInt(Y1–Y2,X,Ans,75)
The area is 325.839962.
Finding the Area between Curves
Problem
Procedure

Texas Instruments TI-82 STATS Specifications

General

Brand	Texas Instruments
Model	TI-82 STATS
Category	Calculator
Language	English