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GMAT Prep : DS

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GMAT Prep : DS [#permalink] New post 04 Jul 2006, 12:57
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A
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D
E

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 [#permalink] New post 04 Jul 2006, 13:25
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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 [#permalink] New post 04 Jul 2006, 13:58
When 2-SQRT(x) is -ve then the expression become undefined.

This happens when x = 5
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 [#permalink] New post 04 Jul 2006, 15:33
5
sqrt(5) > 2
can not take a sqrt of a negative...
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 [#permalink] New post 05 Jul 2006, 01:18
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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 [#permalink] New post 05 Jul 2006, 09:08
Thanks Guys. My funda on Imaginary number is crystal clear :)
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 [#permalink] New post 05 Jul 2006, 14:25
Easy one... E. 5.

SQRT(5) = 2.xx

SQRT(2-2.xx) = SQRT(-ve number) = imaginary.
  [#permalink] 05 Jul 2006, 14:25
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