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

 It is currently 31 Aug 2016, 10:29

### 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

# pl help

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 12 Mar 2009
Posts: 312
Followers: 2

Kudos [?]: 252 [0], given: 1

### Show Tags

17 Jan 2010, 11:11
00:00

Difficulty:

(N/A)

Question Stats:

33% (02:09) correct 67% (01:25) wrong based on 7 sessions

### HideShow timer Statistics

Q21:
If x < 0, then √(-x│x│) is
7
A. -x
B. -1
C. 1
D. x
E. √x

OA is
[Reveal] Spoiler:
a
Manager
Joined: 27 Apr 2008
Posts: 190
Followers: 1

Kudos [?]: 65 [0], given: 1

### Show Tags

17 Jan 2010, 11:35
Since we know that x<0, -(-ve number) = +number, so we can rewrite the eq as:
$$\sqrt{x|x|}$$
=$$\sqrt{x*x}$$
=$$\sqrt{x^2}$$

The answer is always going to be a +ve number. Since we know that x<0, the answer is A.
Math Expert
Joined: 02 Sep 2009
Posts: 34527
Followers: 6313

Kudos [?]: 80083 [0], given: 10027

### Show Tags

17 Jan 2010, 13:27
Check this out: square-root-positive-or-negative-27462.html
_________________
Re: pl help   [#permalink] 17 Jan 2010, 13:27
Similar topics Replies Last post
Similar
Topics:
Geometry problem help pls 1 10 Nov 2015, 04:42
A difficult math, pls help 4 24 Jul 2011, 04:01
Pls help me to sovle this problem, thank you.... 5 22 Jul 2011, 20:24
Pls help (Probability w. dice) 3 07 Jun 2010, 06:46
Help me understand this one pls... 4 17 Apr 2010, 01:42
Display posts from previous: Sort by