Finding The Area Under A Curve - Casio fx-9860GII Instructions Manual

Enter the upper and lower limits, the function and x in the template.
EXE
Press .
The value of the integral is 21.5 (to 3 sf ).

3.2 Finding the area under a curve

Example 37
2
y = 3x − 5
Find the area bounded by the curve, the x-axis and the lines x = –1 and x = 1.
MENU
Press . You will see the dialog box as shown on the right.
Choose 5: GRAPH and press
Press OPTN F2 CALC.
Enter the function y = 3x
Press SHIF T F3 V-Window and choose
which are −10 ≤ x ≤ 10 and −10 ≤ y ≤ 10.
Press EXE and F6 DRAW.
The graph of y = 3x 2 − 5 is displayed with the default axes.
Change the axes to make the curve fi t the screen better.
For help with changing
axes, see your GDC
manual.
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser's institute
EXE
.
2 − 5 and press EXE .
F3 STD for the default axes
Casio fx-9860GII
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Using a graphic display calculator 36