[ 5 posts ]

 Print view Previous topic | Next topic

#### algebra

Author Message
 Post subject: algebra  Posted: Mon Mar 05, 2012 2:34 pm
 Students

Posts: 51
 if x <0; then sqrt(-x|x|) is1. -x2. -13. 14. x5. sqrt xOA : -x....i think it should be x... please do explain how it is -xTanya

 Post subject: Re: algebra  Posted: Mon Mar 05, 2012 8:38 pm
 Students

Posts: 8
 I agree - The answer should be xI would have ruled out -x by looking at it because it's not negative unless we are dealing with imaginary numbers (which is out of scope for GMAT i believe)Any thoughts?

 Post subject: Re: algebra  Posted: Mon Mar 05, 2012 8:40 pm
 Students

Posts: 8
 Btw - by it's I meant "Sqrt of a number". You might have guessed it (good practice for SC though ;-))

 Post subject: Re: algebra  Posted: Wed Mar 07, 2012 3:02 pm
 Forum Guests

Posts: 27
 Good question !The answer is -X indeed..tanya and vijay...it is given in the question stem that X < 0, so we know for that it is negative.Also, we know that the value of sqrt (of any number) must be positive.So if your answer is X, then you are actually proving that the sqrt (-X|X|) is negative...since X is a negative quantity.How can that be possible ? So the answer is -X !Hope it helps...Thanks,Shubh

 Post subject: Re: algebra  Posted: Wed Mar 07, 2012 8:28 pm
 ManhattanGMAT Staff

Posts: 8179
 read here:if-x-0-then-sqrt-x-x-is-t903.htmlthis thread is now locked; if you have questions, post them there, not here. thanks. _________________Being well-dressed gives a feeling of inward tranquillity [that] religion is powerless to bestow.C.F. Forbes

Display posts from previous:  Sort by

[ 5 posts ]

#### Who is online

 Users browsing this forum: No registered users and 1 guest

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ Ask An Instructor    General GMAT Strategy Questions    GMAT Math       General Math Questions       GMAT Prep Math       Manhattan GMAT CAT Math       Manhattan GMAT Non-CAT Math       Official Guide Math    GMAT Verbal       General Verbal Questions       GMAT Prep Verbal       Manhattan GMAT CAT Verbal       Manhattan GMAT Non-CAT Verbal       Official Guide Verbal    GMAT Integrated Reasoning (IR)       GMAT Prep IR       Manhattan GMAT CAT IR       Manhattan GMAT Non-CAT IR    GMAT AWA Essays Manhattan GMAT    Ask Student Services    Study Groups    GMAT Test Day    Test Centers    Instructor Feedback    Course Feedback B-School    Ask an mbaMission Admissions Consultant    B-School Essays    Business Schools    Professional Networking