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EL-9650/9600c/9450/9400 Graphing Calculator
8-5
There may be differences in the results of calculations and graph plotting depending on the setting.
Return all settings to the default value and delete all data.
Notes
Step & Key Operation
(When using EL-9650/9600c)
*Use either pen touch or cursor to operate.
Display
(When using EL-9650/9600c)
Evaluating Absolute Value Functions
The absolute value of a real number x is defined by the following:
|x| = x if x
≥
0
-x if x
≤
0
Note that the effect of taking the absolute value of a number is to strip away the minus sign
if the number is negative and to leave the number unchanged if it is nonnegative.
Thus, |x|
≥
0 for all values of x.
Evaluate various absolute value functions.
Example
1. Evaluate |- 2(5-1)|
2. Is |-2+7| = |-2| + |7|?
Evaluate each side of the equation to check your answer.
Is |x + y| =|x|+ |y| for all real numbers x and y ?
If not, when will |x + y| = |x|+|y| ?
3. Is | | = ?
Evaluate each side of the equation to check your answer. Investigate with
more examples, and decide if you think |x / y|=|x|/|y|
6-9
1+3
1-1
Access the home or computation
screen.
1-2
Enter y = |-2(5-1)| and evaluate.
*
*
2-1
Evaluate|-2 + 7|. Evaluate|-2|+|7|.
|-2 + 7| = 5, |-2| + |7| = 9
➞|-2 + 7| ≠ |-2| + |7|.
*
*
*
|6-9|
|1+3|
The solution is
+
8.
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MATH MATH
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