BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

GMAT Prep - Modulus & Square Roots

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 55
Joined: Sat Nov 10, 2007 10:35 am
Thanked: 1 times

Re: GMAT Prep - Modulus & Square Roots

by olika » Fri Aug 08, 2008 6:28 am
Is the ans. E?

root (5) is greater than root (2), so substract and you result in negative number which is not the real number.
Top
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Fri May 23, 2008 11:14 am

by aditikedia » Fri Aug 08, 2008 6:58 am
Yes it is the answer. However, not sure whether it's ok to stop the moment you get square root of a negative number.

A detailed explanation would really help here..
Top
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Fri Aug 08, 2008 4:44 am
Thanked: 4 times
GMAT Score:750

by santa_dem » Fri Aug 08, 2008 7:04 am
aditikedia wrote:Yes it is the answer. However, not sure whether it's ok to stop the moment you get square root of a negative number.

A detailed explanation would really help here..
Actualy, it's ok to stop, 'cause root of a negative is not a real number, therefore the whole expresion is not a real number.
Top
Senior | Next Rank: 100 Posts
Posts: 50
Joined: Tue Mar 11, 2008 6:30 am
Thanked: 6 times

by bourne159 » Fri Aug 08, 2008 1:46 pm
Answer is E.

The square root of a negative number is not a real number.
In GMAT I think you should stop as soon as you see a square root of a negative number since GMAT does not deal with imaginary numbers etc...
Top
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Fri May 23, 2008 11:14 am

by aditikedia » Fri Aug 08, 2008 5:49 pm
Thanks everyone! :)
Top
Master | Next Rank: 500 Posts
Posts: 172
Joined: Mon Jun 23, 2008 12:00 pm
Thanked: 3 times
Followed by:1 members

by smclean23 » Sun Aug 10, 2008 7:30 pm
Could someone explain the step by step process?
Top
Legendary Member
Posts: 829
Joined: Mon Jul 07, 2008 10:09 pm
Location: INDIA
Thanked: 84 times
Followed by:3 members

by sudhir3127 » Sun Aug 10, 2008 8:07 pm
IF you solve only sqroot(2- sqroot x) part it is enough

take X to be 5. which is 2.23
sqroot ( 2- sqroot 5)

sqroot ( 2- 2.23)
sqrt( -0.23)

As sq root of a negative number is non real. the answer shud be 5.

hope it helps..
Top
Post new topic Post Reply
• Page 1 of 1