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Is x an integer ?

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Is x an integer ? [#permalink] New post 15 Oct 2012, 12:12
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Last edited by Bunuel on 23 Jan 2015, 05:48, edited 1 time in total.
Added the OA.
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Re: Is x an integer ? [#permalink] New post 15 Oct 2012, 12:21
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Is x an integer ?

(1) (3x+4) ( x+2) = 0 --> \(x=-\frac{4}{3}\), so not an integer or \(x=-2=integer\). Not sufficient.

(2) x^2 is an even integer. If \(x=2\), the answer is YES but if \(x=\sqrt{2}\), then the answer is NO. Not sufficient.

(1)+(2) Since if \(x=-\frac{4}{3}\), then \(x^2\) won't be an even integer, then \(x\) must be -2, thus integer. Sufficient.

Answer: C.

Hope it's clear.
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Re: Is x an integer ? [#permalink] New post 23 Jan 2015, 03:37
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Re: Is x an integer ? [#permalink] New post 09 Feb 2016, 00:05
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Re: Is x an integer ? [#permalink] New post 09 Feb 2016, 01:57
statement 2 alone is sufficient . If x^2 is an even integer , then x will be a integer .
The OA must be B .
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Re: Is x an integer ? [#permalink] New post 09 Feb 2016, 02:02
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4d wrote:
statement 2 alone is sufficient . If x^2 is an even integer , then x will be a integer .
The OA must be B .


Please try to read the thread: is-x-an-integer-140765.html#p1131692

(2) x^2 is an even integer. If \(x=2\), the answer is YES but if \(x=\sqrt{2}\), then the answer is NO. Not sufficient.
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PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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Re: Is x an integer ?   [#permalink] 09 Feb 2016, 02:02
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