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sqaure root of 4

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vagarwal7
 Post subject: sqaure root of 4
 Post Posted: Sun May 13, 2012 6:07 pm 
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I have a stupid q/s ..

In Manhattan guide says (Number properties i chapter 6 Roots strategy)

1. if √4 = x, then x =2

2. if x^2 = 4 then x= 2 or x= -2

I never understood point 1.. I always knew point 2
Please can someone explain
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mengnu.liang
 Post subject: Re: sqaure root of 4
 Post Posted: Sun May 20, 2012 12:06 pm 
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I read from many books that GMAT consider the square root of a number to be positive.
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tim
 Post subject: Re: sqaure root of 4
 Post Posted: Sat May 26, 2012 9:55 pm 
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yes. so when the GMAT writes the square root symbol, you only take the positive value. when you write the square root symbol as part of your calculations, the GMAT didn't put the symbol there so you have to account for both possible solutions..

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Tim Sanders
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