The Absolute Value of a Number, x 
 The first
function an algebra I student
encounters is
absolute value, or
distance from zero. When written in symbols it looks like: x. When used on a calculator,
it looks like: abs(x).

 Ex 1.

 1st: Press the ABS or the abs( button.
 TI82: Press [2nd] then [x^{1}], (left column) for ABS.
 TI83 or the TI85, in the NUM (for number), abs(
 2nd: Type the number and the right parenthises, ).
 3rd: Press ENTER to execute the command.
Compute with Fractions 
 Each
fraction is really a division
waiting to be completed. The division combined with
order of operations, and
parenthises as
inclusion marks makes any fraction computation possible.

 Ex 1. Write 4/5 as a decimal.
 Type 4/5 and press [ENTER].
 The result is .8 or 0.8.

 You might wish to undo the division and
change this into a fraction using the calculator.

 Ex 2. Simplify 4/5 + 2/3
 Type 4/5 + 2/3, press [ENTER]
 Type (4/5) + (2/3), press [ENTER].

 Ex 3. Simplify 2 4/5 + 2/3
 Type (2 + 4/5) + 2/3, press [ENTER], or,
 Type 2 + 4/5 + 2/3, press [ENTER].

 Ex 4. Simplify 2 4/5  1 2/3
 Type 2 + 4/5  (1 + 2/3), press [ENTER], or,
 Type (2 + 4/5)  (1 + 2/3), press [ENTER].

Change a deciaml to a fraction 
 The
FRAC button permits the user to change many decimal
numbers to a fraction representation of that number.

 Ex 1. A decimal number is displayed on the
home screen.

 1st: Press the
FRAC button located on the:
 TI82 or the TI83, in the MATH, 1:
FRAC
 TI85, in the MISC (for miscellaneous),
FRAC
 2nd: Press ENTER to execute the command.
STO or store 
 STO permits the user to store a
constant value, or in more sophisticated machines, a
variable expression in the
calculator so that its value may be saved or used.

 Ex 1. Store the number 2 in the storage location named x

 1st: Type 2 on the display.
 2nd: Press the STO key.
 3rd: Press the X key
 The calculator displays:
 2 STO
X
 4th: Press ENTER to execute the command and the
2 appears on the display.

 Ex 2. Store the number 2 in the storage location named A

 1st: Type 2 on the display.
 2nd: Press the STO key.
 3rd: Press the ALPHA then A. The color of the ALPHA
key is the same as the color of the printing of the letters above the keys.
 The calculator displays:
 2 STO
A
 4th: Press ENTER and the 2 appears on the display.
Evaluate an expression
 Once a value has been stored, it may be used to
evaluate an
expression.


 Ex. Evaluate 2x when x is 6

 1st: Type 6 on the display.
 2nd: Press the STO key.
 3rd: Press the X key or ALPHA then X.
 (The color of the ALPHA key is the same as the color of the
printing of the letters above the keys.)
 4th: Press ENTER and the 6 appears on the display.
 5th: Type 2x on the display.
 6th: Press ENTER and 12 appears on the display
 because 2(6) is 12.
You CAN'T COMBINE LIKE TERMS 
 Unless the calculator has symbol manipulation capabilities
like the HP38, HP48, TI89, TI92, it can not
combine
like terms.

 You can
evaluate an expression like
 2x + 3(x + 1) + 6x  8 for a specific value of x.

 You can not
simplify
2x + 3(x + 1) + 6x  8 as
 2x + 3x + 3 + 6x  8 or finally 11x  5.

 There is no way to store the value of x as x. Ordinary
graphing calculators do not accept symbols as variable values.
Raise A Number to A Power 
 The
caret, ^ , or the
ytothex, y^{x},
or the xtothey, x^{y}, is used to exponentiate or
raise to a power.

 Ex 1. Simplify 3^{2}.
 Type 3 ^ 2 and press [ENTER].
 The result is 9.

