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# absolute value of a negative number? working from answer to stem?

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Intern
Joined: 23 Jul 2015
Posts: 32
absolute value of a negative number? working from answer to stem? [#permalink]

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10 Sep 2017, 15:57
Is the $$\sqrt{x}$$ a prime number?

(1) x = 9 or -9

This has more to do with how DS works and if you are suppose to work from question stem to answers or answer to question stem. Is statement (1) sufficient?

Do you just assume x=9 since you can not take the square root of -9, thus x can only equal 9 and the square root of 9 is 3 (a prime number).
- OR -
do you assume since x can also be -9 and you can not take the square root of a negative number, thus $$\sqrt{-9}$$ is not valid and thus can not equal a prime number, thus statement 1 is not sufficent
Manager
Joined: 31 Oct 2016
Posts: 87
Re: absolute value of a negative number? working from answer to stem? [#permalink]

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12 Sep 2017, 01:10
Statement 1 is not sufficient since it gives us both yes and no
Re: absolute value of a negative number? working from answer to stem?   [#permalink] 12 Sep 2017, 01:10
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