• Support PF! Buy your school textbooks, materials and every day products Here!

Absolute value notation removal

  • #1
2
0

Homework Statement


Rewrite |x| < 1 and |x| > 1 by eliminating the absolute value sign

Homework Equations


|x| < 1 = -1 < x < 1
|x| > 1 = ?

The Attempt at a Solution


I know that |x| < 1 can be rewritten as -1 < x < 1 but I'm not sure about |x| > 1. Am I right to assume that |x| > 1 = -1 > x > 1?
 

Answers and Replies

  • #2
|x| > 1 = -1 > x > 1?
Not quite.
|x| < 1 = -1 < x < 1
You did this one correctly.
If you can't think about |x|>1 separately,then you can use your previous answer to find this one.

Plot the number line.
Any number on this line will either satisfy:
|x|>1 or |x| <1
There can't be any number not falling into any of these 2 classes.
So,if a number ain't in the first class,it's surely going to be in the second class (neglecting x=1,of course).
Getting what to do now???
 
  • #3
RUber
Homework Helper
1,687
344
Am I right to assume that |x| > 1 = -1 > x > 1?
The way you have this written is that -1 is greater than x AND x is greater than 1. Is that even possible?
Remember when you negate an AND statement, like -1<x<1 which is read -1 is less than x AND x is less than 1, you will get an OR statement.
 
  • #4
33,630
5,288
Thread closed, as a previous account of the OP's was permanently banned.
 

Related Threads on Absolute value notation removal

Replies
9
Views
2K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
2
Views
873
  • Last Post
Replies
13
Views
1K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
5
Views
2K
Top