Chapter 1: Operating the TI-84 Plus Silver Edition
30
Negation
To enter a negative number, use the negation key. Press
Ì
and then enter the number. On the
TI-84 Plus, negation is in the third level in the EOS™ hierarchy. Functions in the first level, such as
squaring, are evaluated before negation.
Example:
M
X
2
, evaluates to a negative number (or 0). Use parentheses to 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
9
¯ ¹
7
, or if you press
Ì
to indicate subtraction, as in
9
Ì
7
, an error occurs. If
you press
ƒ
A
Ì ƒ
B
, it is interpreted as implied multiplication (
A
…M
B
).
Special Features of the TI-84 Plus
Flash – Electronic Upgradability
The TI-84 Plus uses Flash technology, which lets you upgrade to future software versions without
buying a new graphing calculator.
As new functionality becomes available, you can electronically upgrade your TI-84 Plus from the
Internet. Future software versions include maintenance upgrades that will be released free of
charge, as well as new applications and major software upgrades that will be available for
purchase from the TI Web site:
. For details, refer to Chapter 19.
1.5 Megabytes of Available Memory
1.5 MB of available memory are built into the TI-84 Plus Silver Edition, and 0.5 MB for the
TI-84 Plus. About 24 kilobytes (K) of RAM (random access memory) are available for you to
compute and store functions, programs, and data.
About 1.5 M of user data archive allow you to store data, programs, applications, or any other
variables to a safe location where they cannot be edited or deleted inadvertently. You can also free
up RAM by archiving variables to user data. For details, refer to Chapter 18.
Applications
Many applications are preloaded on your TI-84 Plus and others can be installed to customize the
TI-84 Plus to your needs. The 1.5 MB archive space lets you store up to 94 applications at one
time on the TI-84 Plus Silver Edition. Applications can also be stored on a computer for later use or
linked unit-to-unit. There are 30 App slots for the TI-84 Plus. For details, refer to Chapter 18.
