Operation Manual
Operating the TI
.
82 1-21
8201OPER.DOC TI-82, Chapter 1, English Bob Fedorisko Revised: 02/09/01 12:18 PM Printed:
02/09/01 12:35 PM Page 21 of 22
Implied Multiplication
The TI
.
82 recognizes implied multiplication. For example, it understands
2
p
,
4 sin 46
,
5(1+2)
, and
(2
…
5)7
as implied multiplication.
Parentheses
All calculations inside a pair of parentheses are completed first. For
example, in the expression
4(1+2)
, EOS first evaluates the portion inside
the parentheses,
1+2
, and then multiplies the answer,
3
, by
4
.
You can omit any right (close) parenthesis at the end of an expression. All
“open” parenthetical elements are closed automatically at the end of an
expression and preceding the
!
(store) or display conversion instructions.
Note: If the name of a list or matrix is followed by an open parenthesis, it
does not indicate implied multiplication. It is used to access specific
elements in the list (Chapter 11) or matrix (Chapter 10).
Negation
To enter a negative number, use the negation function. Press
Ì
and then
enter the number. On the TI
.
82, negation is in the fourth group in the EOS
hierarchy. Functions in the first group, such as squaring, are evaluated
before negation.
For example,
M
X
2
is a negative number (or 0);
M
9
2
is
M
81
. Use parentheses to
square a negative number:
(
M
9)
2
.
Note: Use the
¹
key for subtraction and the
Ì
key for negation. If you
press
¹
to enter a negative number, as in
9
¯
¹
7
, or if you press
Ì
to
indicate subtraction, as in
9
Ì
7
, it is an error. If you press
ƒ
A
Ì
ƒ
B
, it is interpreted as implied multiplication (
A
…M
B
).