Calculator User Manual

Chapter 2: Operating the Calculator 27
02OPER DOC TI
-
89/TI
-
92 Plus: O
p
erating the TI
-
89/TI
-
92 Plus (English) Susan Gullord Revised: 02/23/01 1:06 PM Printed: 02/23/01 2:11 PM Page 27 of 44
Expressions are evaluated according to the Equation Operating
System (EOS
é
) 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
4(1+2)
, EOS first evaluates
(1+2)
and then multiplies the
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
TI
.
89:
2W
or
TI
.
92 Plus:
W.
— or —
¦
Select it from a menu, if available. For example, select
2:abs
from
the
Number
submenu of the
MATH
menu.
— or —
¦
Type the name letter-by-letter from the keyboard. (On the
TI
-
89
,
use
j
and
2 ™
to type letters.) You can use any mixture
of uppercase or lowercase letters. For example, type
sin(
or
Sin(
.
Calculate
3.76 ÷ (
ë
7.9 +
‡
5) + 2 log 45
.
On the TI
.
89: On the TI
.
92 Plus: Display
3.76
e
c·
7.9
«2]
3.76
e
c·
7.9
«2]
3.76/(
ë
7.9+‡(
2 ]
inserts
‡
( because its
argument must be in parentheses.
5
dd
5
dd
3.76/(
ë
7.9+‡(5))
Use
d
once to close
‡
(5) and
again to close (
ë
7.9 +
‡
5).
«
2
2™
LOG
j
c
45
d
«
2
LOG
c
45
d
3.76/(
ë
7.9+‡(5))+2log(45)
log
requires ( ) around its
argument.
¸¸
To enter more than one
expression or instruction
at a time, separate them
with a colon by pressing
2Ë
.
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
Displays last result only.
!
is displayed when you press
§
to store a value to a variable.
Type the function name in this
example.