EL-9600/9400 Graphing Calculator
Notes
Step & Key Operation
(When using EL-9600)
*Use either pen touch or cursor to operate.
Display
(When using EL-9600)
The
y
-intercept is at (0 ,1). No-
tice that there are no
x
-inter-
cepts for the graph of
f
(
x
)
.
9-1
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2
Find the domain and the vertical
asymptote of
f
(
x
), tracing the
graph to find the hole at
x
= 1.
Since
f
(
x
) can be written as
, the domain
consists of all real numbers
x
such that
x
≠
1 and
x
≠
-1.
There is no vertical asymptote
where
x
= 1 since this value
of
x
also makes the numera-
tor zero. Next to the coordi-
nates
x
= 0.9,
y
= 0.52, see that
the calculator does not display
a value for
y
at
x
= 1 since 1
is not in the domain of this
rational function.
(repeatedly)
Find the
x-
and
y-
intercepts of
f
(
x
)
.
*
3
4
Estimate the horizontal asymptote
of
f
(
x
)
.
The line
y
= 0 is very likely a
horizontal asymptote of
f
(
x
)
.
The graphing feature of the EL-9600/9400 can create the branches of rational
function separated by vertical asymptote. The calculator allows the points of
intersection to be obtained easily.
x
- 1
(
x +
1)(
x -
1)
TRACE
2nd F CALC
6
HB1.DocD.
98.10.1, 6:13 PM
7
