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Moderator  Joined: 18 Apr 2015
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x < 0 [#permalink]
Expert's post 00:00

Question Stats: 45% (00:21) correct 55% (00:40) wrong based on 20 sessions

$$x < 0$$

 Quantity A Quantity B $$x^2 - x^5$$ $$0$$

A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
[Reveal] Spoiler: OA

_________________

Last edited by Carcass on 27 Dec 2018, 09:47, edited 2 times in total.
Edited the OA
Manager Joined: 29 Nov 2017
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Location: United States
GRE 1: Q142 V146 WE: Information Technology (Computer Software)
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Re: x < 0 [#permalink]
if X is negative then if we suppose entity A will be over all positive then A is greater than B.

Last edited by IshanGre on 16 May 2018, 05:40, edited 1 time in total. GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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Re: x < 0 [#permalink]
1
KUDOS
Expert's post
IshanGre wrote:
if X is negative the if we suppose entity A will be over all positive then A is greater than B.

This is actually a tricky question

Given that x<0

Quantity A: $$x^2-x^5 = x^2(1-x^3)$$ now $$x^2$$ is always positve as $$x \neq 0$$ but $$1-x^3$$ may or maynot be positive.

If $$|x| > 0$$ then $$1-x^3$$ is negative.

Try plugging values: $$x=-0.5$$

Quanity A: 0.21875 here quantity A is greater.

$$x=-1.5$$

Quanity A: -5.34375 here quantity B is greater.

Hence the correct option is D.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

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Re: x < 0 [#permalink]
1
KUDOS
sandy wrote:
IshanGre wrote:
if X is negative the if we suppose entity A will be over all positive then A is greater than B.

This is actually a tricky question

Given that x<0

Quantity A: $$x^2-x^5 = x^2(1-x^3)$$ now $$x^2$$ is always positve as $$x \neq 0$$ but $$1-x^3$$ may or maynot be positive.

If $$|x| > 0$$ then $$1-x^3$$ is negative.

Try plugging values: $$x=-0.5$$

Quanity A: 0.21875 here quantity A is greater.

$$x=-1.5$$

Quanity A: -5.34375 here quantity B is greater.

Hence the correct option is D.

Hi Sandy, if the correct answer is D, can you please update the Reveal Answer to D? It is still A.
Intern Joined: 15 May 2018
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Kudos [?]: 5 , given: 1

Re: x < 0 [#permalink]
Carcass wrote:
$$x < 0$$

 Quantity A Quantity B $$x^2 - x^5$$ $$0$$

A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given

answer must be a in all cases Intern Joined: 25 May 2018
Posts: 3
Followers: 0

Kudos [?]: 3  , given: 0

Re: x < 0 [#permalink]
1
KUDOS
Answer is A not D
Moderator  Joined: 18 Apr 2015
Posts: 5888
Followers: 96

Kudos [?]: 1154 , given: 5471

Re: x < 0 [#permalink]
Expert's post
The students are right. The OA is A. D is wrong.

Thank you so much for the feedback.

Regards
_________________ Re: x < 0   [#permalink] 04 Jul 2018, 00:59
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