1-6 Operating the TI-83
8301OPER.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:09 PM Printed: 02/19/01 1:34
PM Page 6 of 24
An expression is a group of numbers, variables, functions
and their arguments, or a combination of these elements.
An expression evaluates to a single answer. On the TI.83,
you enter an expression in the same order as you would
write it on paper. For example, pR2 is an expression.
You can use an expression on the home screen to calculate
an answer. In most places where a value is required, you
can use an expression to enter a value.
To create an expression, you 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
Equation Operating System (EOSé) rules (page 1.22), and
the answer is displayed.
Most TI.83 functions and operations are symbols
comprising several characters. You must enter the symbol
from the keyboard or a menu; do not spell it out. For
example, to calculate the log of 45, you must press « 45.
Do not enter the letters L, O, and G. If you enter LOG, the
TI.83 interprets the entry as implied multiplication of the
variables L, O, and G.
Calculate 3.76 ÷ (L7.9 + ‡5) + 2 log 45.
3 Ë 76 ¥ £ Ì 7 Ë 9 Ã
y [‡] 5 ¤ ¤
à 2 « 45 ¤
Í
To enter two or more expressions or instructions on a line,
separate them with colons (ƒ [:]). All instructions are
stored together in last entry (ENTRY; page 1.16).
Entering Expressions and Instructions
What Is an
Expression?
Entering an
Expression
Multiple Entries
on a Line