TI -82 Manual Book page 45

Implied Multiplication
The TI.82 recognizes implied multiplication. For example, it understands
,
2p 4 sin 46
Parentheses
All calculations inside a pair of parentheses are completed first. For
example, in the expression
the parentheses,
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
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,
square a negative number:
Note: Use the ¹ key for subtraction and the Ì key for negation. If you
press ¹ to enter a negative number, as in
indicate subtraction, as in
ƒ
B , it is interpreted as implied multiplication (
, , and
5(1+2) (2...5)7
4(1+2)
1+2 , and then multiplies the answer,
2
MX is a negative number (or 0);
(M9)
Ì
9
as implied multiplication.
, EOS first evaluates the portion inside
!
(store) or display conversion instructions.
M9
2
.
¯ ¹
9
, it is an error. If you press ƒ
7
Operating the TI.82 1-21
3 , by 4 .
2
is M81 . Use parentheses to
, or if you press Ì to
7
A...MB ).
Ì
A