GMAT Prep : DS

Question

Please see the attachment for the question

XxxyyY · Answer

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.

ps_dahiya · Answer

When 2-SQRT(x) is -ve then the expression become undefined.

This happens when x = 5

acfuture · Answer

5
sqrt(5) > 2
can not take a sqrt of a negative...

jaynayak · Answer

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

briozeal · Answer

Thanks Guys. My funda on Imaginary number is crystal clear

haas_mba07 · Answer

Easy one... E. 5.

SQRT(5) = 2.xx 

SQRT(2-2.xx) = SQRT(-ve number) = imaginary.

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