GMAT Course Discounts | GMAT Course Reviews

Sqroots

[This topic has 4 member replies]
Forum Index GMAT Math Problem Solving
Write Like an Expert Series: Breaking Down This Year's Top B-School Essays – From HBS to GSB, experts break down each essay. This series is FREE. Reserve Your Spot!
Post New Topic   Post Reply

Lookingfor700GMAT
Rising GMAT Star

Default Avatar

Joined: 08 Feb 2010
Posts: 39

Thanks given: 0
Thanked 0 times in 0 posts
Topic: Sqroots
PostWed Mar 10, 2010 10:19 am
Elapsed Time:
00:00
 Lap   Improve your GMAT score with this timer
If x < 0 then square root of -x|x|

is -x,-1,1,x or square root of x. I chose X but it is - x

Isn't - (a negative number) a positive number then you times it with x so x multiplied by x is x^2 which is x after being square rooted?
Recommend this topic
Back to top
View user's profile Send private message
Beat The GMAT Practice Questions -- You'll Love Them!
osirus0830
GMAT Titan

Default Avatar

Joined: 28 May 2009
Posts: 1567

Thanks given: 67
Thanked 115 times in 111 posts

GMAT Score: 730
PostWed Mar 10, 2010 11:22 am
it can't be negative x. What is the source. if you have a negative number and you put a negative sign with that number it becomes pos. I think the book may have made a mistake.
_________________
http://www.beatthegmat.com/the-retake-osirus-blog-t51414.html
Back to top
View user's profile Send private message
Lookingfor700GMAT
Rising GMAT Star

Default Avatar

Joined: 08 Feb 2010
Posts: 39

Thanks given: 0
Thanked 0 times in 0 posts
PostWed Mar 10, 2010 11:40 am
Do you make the answer x?
Back to top
View user's profile Send private message
Lookingfor700GMAT
Rising GMAT Star

Default Avatar

Joined: 08 Feb 2010
Posts: 39

Thanks given: 0
Thanked 0 times in 0 posts
PostWed Mar 10, 2010 11:41 am
It was on GMAT Prep 2
Back to top
View user's profile Send private message
osirus0830
GMAT Titan

Default Avatar

Joined: 28 May 2009
Posts: 1567

Thanks given: 67
Thanked 115 times in 111 posts

GMAT Score: 730
PostWed Mar 10, 2010 11:46 am
The only way for it to be negative x is if the stimulus reads

- sqrt( -x|x|) Otherwise, there is no way to get a negative number from a square root, because a negative number within a square root is imaginary and imaginary numbers aren't on the GMAT.
_________________
http://www.beatthegmat.com/the-retake-osirus-blog-t51414.html
Back to top
View user's profile Send private message

Related GMAT & MBA Articles

Manhattan GMAT Challenge Problem of the Week – 25 May 2010

To Factor or to FOIL: Dividing by Zero on the GMAT

Manhattan GMAT Challenge Problem of the Week – 19 Aug 2010

1 Minus the Probability I Won’t Ace the GMAT…

“Two Trains…” Part 2 (Dealing with Multiple Rates Questions)
Display posts from previous:   

Post New Topic   Post Reply All times are GMT - 7 Hours
Page 1 of 1
 
Forum Index GMAT Math Problem Solving
Best Conversation Starters
1. gmat_perfect 93 topics
2. sanju09 86 topics
3. pradeepkaushal9518 57 topics
4. Gurpinder 53 topics
5. adi_800 30 topics
See More Top Beat The GMAT Members
Most Active Experts
1. Tani Wolff - Kaplan
Kaplan GMAT Teacher 		145 posts
2. Rahul@gurome
Gurome 		131 posts
3. GMATGuruNY
The Princeton Review Teacher 		100 posts
4. Stuart Kovinsky
Kaplan GMAT Teacher 		95 posts
5. David@VeritasPrep
Veritas Prep 		77 posts
See More Top Beat The GMAT Experts