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M28-50

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Intern
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Joined: 07 May 2018
Posts: 4
Location: India
Concentration: Leadership, General Management
GMAT 1: 670 Q48 V34
GMAT 2: 710 Q48 V40
GPA: 3
Re: M28-50  [#permalink]

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New post 29 Aug 2018, 13:18
Got it. Thanks for Opening my eyes. Thank you so much. :thumbup:
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Joined: 23 Aug 2017
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Re: M28-50  [#permalink]

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New post 16 Dec 2018, 22:45
Bunuel...
Reg Statement (2)..shouldnt we need to consider that Root(X) and Root(y) can also be the negative numbers...thus rendering the Statement insufficient?
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Re: M28-50  [#permalink]

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New post 16 Dec 2018, 23:47
Debashis Roy wrote:
Bunuel...
Reg Statement (2)..shouldnt we need to consider that Root(X) and Root(y) can also be the negative numbers...thus rendering the Statement insufficient?


First of all, (2) says that \(\sqrt{x}\) and \(\sqrt{y}\) are prime numbers. Only positive numbers can be primes.

Next, when the GMAT provides the square root sign for an even root, such as a square root, fourth root, etc. then the only accepted answer is the non-negative root. That is:

\(\sqrt{9} = 3\), NOT +3 or -3;
\(\sqrt[4]{16} = 2\), NOT +2 or -2;

Notice that in contrast, the equation \(x^2 = 9\) has TWO solutions, +3 and -3. Because \(x^2 = 9\) means that \(x =-\sqrt{9}=-3\) or \(x=\sqrt{9}=3\).
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Re: M28-50   [#permalink] 16 Dec 2018, 23:47

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M28-50

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