GMAT Prep Question help needed : Tomo is my exam

Expert replies

Previous Topic Next Topic

Anahatha: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Sat Aug 07, 2010 9:15 am

by Anahatha » Wed Jun 01, 2011 3:46 am

Please explain . Thanks in advance

Like this post

Source: Beat The GMAT — Problem Solving | Wed Jun 01, 2011 3:46 am

Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members; Location: India; Thanked: 375 times

by Frankenstein » Wed Jun 01, 2011 3:54 am

Hi,
Square root of a number is always the positive root. If x<0, |x|1=-x
sqrt(-x|x|) = sqrt(-x.-x) = sqrt(x^2) = |x| = -x
Hence, A

Cheers!

Things are not what they appear to be... nor are they otherwise

Like this post

Anahatha: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Sat Aug 07, 2010 9:15 am

by Anahatha » Wed Jun 01, 2011 4:01 am

Thanks a ton for the quick reply. I arrived till the fnal step of getting |x| . |x| can be x or -x. Since the question specifically mentions that x is negative we choose -x. Is my reasoning correct or is there someother way to it ?

Like this post

Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members; Location: India; Thanked: 375 times

by Frankenstein » Wed Jun 01, 2011 4:04 am

Anahatha wrote:Thanks a ton for the quick reply. I arrived till the fnal step of getting |x| . |x| can be x or -x. Since the question specifically mentions that x is negative we choose -x. Is my reasoning correct or is there someother way to it ?

Hi,
Yes.. Your logic is correct.
Good luck for your test!

Cheers!

Things are not what they appear to be... nor are they otherwise

Like this post

Anahatha: Senior | Next Rank: 100 Posts; Posts: 45; Joined: Sat Aug 07, 2010 9:15 am

by Anahatha » Wed Jun 01, 2011 4:13 am

Thanks

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

559 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review