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Chapter 2: Operating the Calculator 25
02OPER DOC TI
-
89/TI
-
92 Plus: O
p
erating the TI
-
89/TI
-
92 Plus (English) SusanGullord Revised:02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 25 of 44
1. Press the negation key
·
. (Do not use the subtraction key
|
.)
2. Type the number.
To see how the
TI
-
89 / TI
-
92 Plus
evaluates a negation in relation to
other functions, refer to the Equation Operating System (EOS
é
)
hierarchy in Appendix B. For example, it is important to know that
functions such as
x
ñ
are evaluated before negation.
Use
c
and
d
to include
parentheses if you have
any doubt about how a
negation will be
evaluated.
If you use
|
instead of
·
(or vice versa), you may get an error
message or you may get unexpected results. For example:
¦
9
p·
7
=
ë
63
— but —
9
p|
7
displays an error message.
¦
6
|
2
=
4
— but —
6
·
2 =
ë
12
since it is interpreted as
6(
ë
2)
, implied multiplication.
¦
·
2
«
4 = 2
— but —
|
2
«
4
subtracts
2
from the previous answer and then adds
4
.
1. Type the part of the number that precedes the exponent. This
value can be an expression.
2. Press:
TI
.
89:
^
TI
.
92 Plus:
2
^
E
appears in the display.
3. Type the exponent as an integer with up to 3 digits. You can use a
negative exponent.
Entering a number in scientific notation does not cause the answers
to be displayed in scientific or engineering notation.
The display format is determined by
the mode settings (pages 29 through
31) and the magnitude of the
number.
Entering Numbers
The keypad lets you enter positive and negative numbers for
your calculations. You can also enter numbers in scientific
notation.
Entering a Negative
Number
Important: Use
|
for
subtraction and use
·
for negation.
Entering a Number
in Scientific
Notation
Evaluated as
ë
(2
ñ
)
Represents 123.45
×
10
-2