Logarithmic Functions; Evaluating Logarithms - Casio fx-9860GII Instructions Manual

Press OPTN F2 GLINK.
As the value of x gets smaller, Y
Press EXIT and then press
Change the minimum value of x to –12.
F5
EXE F6 OPTN
G·CON
Eventually the value of Y
You can see, at the bottom of the screen, that the actual value of Y
2.000001882...
→ 2 as x → − ∞ .
We can say that Y
1
The line x = 2 is a horizontal asymptote to the curve y = 3

Logarithmic functions

1.15 Evaluating logarithms

Example 18
Evaluate log 3.95, ln 10.2 and log
10
Press MENU . You will see the dialog box as shown on the right.
Choose 1: RUN·MAT and press
Press EXIT until you see the menu on the right, then press
F2
Press logab to open the logarithm template.
For natural logarithms it is possible to use the same method, with the base
equal to e, but it is quicker to press
log
10 you can press .
Note that the GDC will evaluate logarithms with any base without having
to use the change of base formula.
© Oxford University Press 2012: this may be reproduced for class use solely for the purchaser's institute
gets closer and closer to 2.
1
F5
SET.
F2
GLINK.
displayed in the table reaches 2.
1
2.
5
EXE
.
ln . Similarly for logarithms to base
Casio fx-9860GII
is
1
x + 2.
F4 MATH.
Using a graphic display calculator 20