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# GMAT Prep : DS

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Manager
Joined: 10 Oct 2005
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04 Jul 2006, 13:57
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Manager
Joined: 25 May 2006
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04 Jul 2006, 14:25
Only 5

sqrt(5) is aprox 2.2...

so 2-2.2 will give you a negative number, and sqrt(neg numb) is an imaginary number.
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Who is John Galt?

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CEO
Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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04 Jul 2006, 14:58
When 2-SQRT(x) is -ve then the expression become undefined.

This happens when x = 5
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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Manager
Joined: 19 Apr 2006
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04 Jul 2006, 16:33
5
sqrt(5) > 2
can not take a sqrt of a negative...

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SVP
Joined: 30 Mar 2006
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05 Jul 2006, 02:18
Clear winner 5

To make the equation an nreal number the value under the roots should be negative.

This can be done only with 5

Hence E

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Manager
Joined: 10 Oct 2005
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05 Jul 2006, 10:08
Thanks Guys. My funda on Imaginary number is crystal clear

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VP
Joined: 02 Jun 2006
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05 Jul 2006, 15:25
Easy one... E. 5.

SQRT(5) = 2.xx

SQRT(2-2.xx) = SQRT(-ve number) = imaginary.

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05 Jul 2006, 15:25
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