Entering Expressions And Instructions - TI -82 Manual Book

Entering Expressions and Instructions

On the TI.82, you can enter expressions, which return a value, in most places
where a value is required. You enter instructions, which initiate an action, on the
Home screen or in the program editor (Chapter 13).
Expressions
An expression is a complete sequence of numbers, variables, functions, and
their arguments that evaluate to a single answer. On the TI.82, you enter an
expression in the same order that it normally is written. For example,
is an expression.
Expressions can be used on the Home screen to calculate an answer. In
most places where a value is required, expressions may be used to enter a
value.
Entering an Expression
To create an expression, enter numbers, variables, and functions from the
keyboard and menus. An expression is completed when you press Í,
regardless of the cursor location. The entire expression is evaluated
according to EOS rules (page 1.20), and the answer displayed.
Most TI.82 functions and operations are symbols with several characters in
them. You must enter the symbol from the keyboard or menu, not spell it
out. For example, to calculate the log of 45, you must press «
cannot type in the letters
entry as implied multiplication of the variables
Calculate 3.76 ÷ (-7.9 + ‡5) + 2 log 45.

¥ £ Ì
3.76
¤ Ã «
5 2
Í
Multiple Entries on a Line
To enter more than one expression or instruction on a line, separate them
with a colon (
1-6 Operating the TI.82
L O G
à y ã
ä
7.9
‡
45
: ). They are all stored together in
. (If you type LOG
L ,
Last Entry
4 5
, the TI.82 interprets the
O , and G .)
(page 1.14).
2
pR
. You