Square Root; Absolute Value - Texas Instruments TI-82 Keystroke Manual

Two special exponents that can be produced on screen as raised exponents are the exponents
2 and 3. To enter the expression
could instead type the 5 and then press the
2 on the screen, not the x. Either way, the calculator produces the result of 25 when you press
ENTER. To produce a raised exponent 3, as in the expression
MATH key. The calculator will display the MATH menu. Choice 3 on the MATH menu is the raised
exponent 3. Select it by pressing 3 (or by using the Down Arrow key to highlight the number 3
and pressing ENTER). The MATH menu will then disappear, and the calculator will display 4
Press ENTER to display the value of the expression, 64.
page 12
9

Square Root

See 3 Square Root.
page 14

10 Absolute Value

The absolute value of a number is the number's distance from zero on the number line. On the TI-
83 the absolute value is denoted abs. To produce the absolute value character, first press MATH.
Then use the Right Arrow key to highlight the NUM menu heading at the top of the screen. Choice
1 on the NUM menu is abs( . Either press ENTER, since choice 1 is already highlighted or press 1
to produce abs( on the screen. When we write the absolute value of −7 with pencil and paper,
we enclose the number within two vertical bars:
is denoted abs(-7). As was the case with the square root, on the TI-83 the number or
expression (called the argument) whose absolute value is to be evaluated must be enclosed within
parentheses. The calculator again saves you a bit of typing by producing the open parenthesis
with the abs. To produce abs(-7)on your Home screen, first use the keystrokes described
above to produce abs( on screen. Then type in −7 (being sure to use the gray negative key), and
close the parentheses. Press ENTER to find the absolute value of −7, which is 7.
As was the case with square roots, the calculator takes the absolute value of the number or
expression enclosed in parentheses immediately to the right of the abs symbol. To evaluate
− 17 +
5 put the expression
first: abs(–17+5). The result is 12, since
− 17 +
value of 5
sure to put a close parenthesis after the
abs(-17)+5. The value of this expression is 22, since
to type the close parenthesis, the calculator will assume that you wanted a close parenthesis
at the end of the expression. Thus, the calculator would interpret abs(-17+5 as being the
same as abs(–17+5), which is 12, as noted earlier. To evaluate
abs(-5)+abs(2)and press ENTER to obtain the value 7.
To multiply the absolute value of −4 by the absolute value of 10,
the multiplication key to type in abs(-4)*abs(10), or you could just put the two absolute
values side-by-side with no symbol in between: abs(-4)abs(10). The calculator still knows
2
5 you could use the standard approach of typing 5^2, or you
− 17 +
5 inside the parentheses, since the addition is to be done
, where the absolute value is to apply only to the number
−
17
2 2
x key. The x key produces only the raised exponent
3
4 , first type 4 and then press the
− . On the calculator the absolute value of −7
7
− + = − =
17 5 12 12
when you enter this expression into the calculator:
− +
17 5
TI-83
. If you want to compute the
−
, you must be
17
= + =
17 5 22 . If you forget
− 5 +
2 you would type in
− 4 ⋅
10 , you could use
35
3
.