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D01-04

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D01-04  [#permalink]

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New post 16 Sep 2014, 00:11
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A
B
C
D
E

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  5% (low)

Question Stats:

77% (00:21) correct 23% (00:23) wrong based on 181 sessions

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New post 16 Sep 2014, 00:11
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New post 26 Nov 2014, 06:27
Hi all
I thought that when you took the square root of a perfect square you only needed to consider the positive answer for GMAT questions so in this case the answer would be B.
Could someone please clarify
Thank you in advance

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New post 26 Nov 2014, 07:14
alexjordan99 wrote:
Hi all
I thought that when you took the square root of a perfect square you only needed to consider the positive answer for GMAT questions so in this case the answer would be B.
Could someone please clarify
Thank you in advance

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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 positive 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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New post 27 Nov 2014, 08:49
Thank you very much !

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Re: D01-04  [#permalink]

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New post 03 Dec 2014, 00:17
Don't we have negative primes?
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New post 29 Jun 2015, 01:00
(1) |x|=2 => x =+2 or x=-2.. NS

(2) x^2 = 4 = > |x| = 2 => x =+2 or x = -2 NS

On combining both mean the same.. Hence Not Sufficient.. Answer is E..
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New post 14 May 2017, 02:24
In the above discussion it is said that we cannot have the negative prime so we will have only +2 as the answer and hence the answer should be d. please explain...
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New post 14 May 2017, 02:31
saaqibpatangiya wrote:
In the above discussion it is said that we cannot have the negative prime so we will have only +2 as the answer and hence the answer should be d. please explain...


Not sure what to explain there... Each statement gives TWO possible value of x: 2 and -2. The question asks whether x is a prime number. If x = 2, then YES x is a prime number but if x is -2, then NO x is NOT a prime number. We have two different answers to the question, thus not sufficient.

Hope it helps.
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New post 15 Sep 2018, 16:51
Hi, sorry if this is a dumb question, but I thought the |x| signaled "absolute value" of a number? So even if you had a negative number it would still be a positive? 2 spots away from zero? So if x=2 then it would be enough information to answer whether x was a prime number? Does my question make sense?
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New post 16 Sep 2018, 01:16
ewatts wrote:
Hi, sorry if this is a dumb question, but I thought the |x| signaled "absolute value" of a number? So even if you had a negative number it would still be a positive? 2 spots away from zero? So if x=2 then it would be enough information to answer whether x was a prime number? Does my question make sense?


The question asks whether x is a prime number. (1) says that |x| = 2. So, x can be 2, which is prime or -2 which is NOT prime.
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Re: D01-04   [#permalink] 16 Sep 2018, 01:16
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