Entering An Expression - Texas Instruments TI-89 Manual Book

Parentheses
Entering an
Expression
Example
Note: You can also select
log by using
TI.89: ½
TI.92 Plus: 2 ½
(page 44).
Entering Multiple
Expressions on a
Line
Expressions are evaluated according to the Equation Operating
System (EOSé) hierarchy described in Appendix B. To change the
order of evaluation or just to ensure that an expression is evaluated
in the order you require, use parentheses.
Calculations inside a pair of parentheses are completed first. For
example, in , EOS first evaluates
4(1+2)
answer by .
4
Type the expression, and then press ¸ to evaluate it. To enter a
function or instruction name on the entry line, you can:
¦
Press its key, if available. For example, press
W.
TI.92 Plus:
— or —
¦
Select it from a menu, if available. For example, select
the submenu of the
Number
— or —
¦
Type the name letter-by-letter from the keyboard. (On the
use j and 2 ™ to type letters.) You can use any mixture
of uppercase or lowercase letters. For example, type
Calculate 3.76 ÷ (ë 7.9 + ‡5) + 2 log 45
On the TI.89: On the TI.92 Plus:
3 . 7 6 e 3 . 7 6 e
c · 7 . 9 c · 7 . 9
« 2 ] « 2 ]
5 d d 5 d d
« 2 « 2
2 ™ L O G j L O G
c 4 5 d c 4 5 d
¸ ¸
To enter more than one
expression or instruction
at a time, separate them
with a colon by pressing
2 Ë.
and then multiplies the
(1+2)
TI.89:
menu.
MATH
Type the function name in this
example.
.
3.76/(ë 7.9+‡(
2 ] inserts ‡( because its
argument must be in parentheses.
3.76/(ë 7.9+‡(5))
Use d once to close ‡(5) and
again to close (ë7.9 + ‡5).
3.76/(ë 7.9+‡(5))+2log(45)
log requires ( ) around its
argument.
Displays last result only.
! is displayed when you press §
to store a value to a variable.
Chapter 2: Operating the Calculator
2 W or
from
2:abs
,
TI-89
or .
sin( Sin(
Display
27