Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 31 Aug 2016, 20:12

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Question on modulus?

Author Message
TAGS:

### Hide Tags

Director
Joined: 29 Nov 2012
Posts: 900
Followers: 14

Kudos [?]: 886 [0], given: 543

### Show Tags

21 May 2013, 22:42
1
This post was
BOOKMARKED
For example the question is

x = I X I

then if x > 0 then X = X

and if X < 0 then X = - X

is this correct
_________________

Click +1 Kudos if my post helped...

Amazing Free video explanation for all Quant questions from OG 13 and much more http://www.gmatquantum.com/og13th/

GMAT Prep software What if scenarios http://gmatclub.com/forum/gmat-prep-software-analysis-and-what-if-scenarios-146146.html

Intern
Joined: 17 Apr 2011
Posts: 43
Followers: 0

Kudos [?]: 11 [0], given: 21

### Show Tags

21 May 2013, 23:27
y = |x|
implies
y= x when x>=0
y= - x wen x<0
Moderator
Joined: 02 Jul 2012
Posts: 1230
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Followers: 110

Kudos [?]: 1257 [0], given: 116

### Show Tags

22 May 2013, 00:08
I would add, if x = 0, x = |x|

A condition that is often overlooked and used especially in the DS section.
_________________

Did you find this post helpful?... Please let me know through the Kudos button.

Thanks To The Almighty - My GMAT Debrief

GMAT Reading Comprehension: 7 Most Common Passage Types

Math Expert
Joined: 02 Sep 2009
Posts: 34527
Followers: 6313

Kudos [?]: 80121 [0], given: 10027

### Show Tags

22 May 2013, 03:01
fozzzy wrote:
For example the question is

x = I X I

then if x > 0 then X = X

and if X < 0 then X = - X

is this correct

Absolute value properties:
When $$x\leq{0}$$ then $$|x|=-x$$, or more generally when $$some \ expression\leq{0}$$ then $$|some \ expression|\leq{-(some \ expression)}$$. For example: $$|-5|=5=-(-5)$$;

When $$x\geq{0}$$ then $$|x|=x$$, or more generally when $$some \ expression\geq{0}$$ then $$|some \ expression|\leq{some \ expression}$$. For example: $$|5|=5$$.

For more check Absolute Value chapter of Math Book: math-absolute-value-modulus-86462.html

DS questions on absolute value to practice: search.php?search_id=tag&tag_id=37
PS questions on absolute value to practice: search.php?search_id=tag&tag_id=58

Tough absolute value and inequity questions with detailed solutions: inequality-and-absolute-value-questions-from-my-collection-86939.html

Hope it helps.
_________________
Re: Question on modulus?   [#permalink] 22 May 2013, 03:01
Similar topics Replies Last post
Similar
Topics:
1 Modulus Graphs 3 22 May 2014, 20:46
3 Stuck with Modulus question!!!!! 3 03 Feb 2013, 15:35
MODULUS 3 14 Mar 2012, 18:45
1 Silly doubt about Modulus questions 3 01 Feb 2012, 05:13
6 Is x = \sqrt{x^2} 1. x = even 2. 13<x<17 6 21 Mar 2007, 09:07
Display posts from previous: Sort by