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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
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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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...
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.
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?
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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77% (00:20) correct 
