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# Is x negative ? (1) n^3 <0 (2) x^2-1 <0 Iam struggling

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VP
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Is x negative ? (1) n^3 <0 (2) x^2-1 <0 Iam struggling [#permalink]

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17 May 2008, 08:26
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Is x negative ?
(1) n^3 [1-x^2]<0
(2) x^2-1 <0

Iam struggling with such kind of problems.I would appreciate if you help me understand teh basics here.
Intern
Joined: 26 Apr 2008
Posts: 49
Followers: 1

Kudos [?]: 2 [0], given: 0

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17 May 2008, 10:16
Assuming that n in first statement is x, is the ans C ?
Will explain if correct.
SVP
Joined: 28 Dec 2005
Posts: 1575
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Kudos [?]: 122 [0], given: 2

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17 May 2008, 12:04
even if it was x^3 in stat 1, answer is either B or D

from stat 2, x must be between 0 and 1, i.e. it cannot be negative.
Senior Manager
Joined: 19 Apr 2008
Posts: 320
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Kudos [?]: 63 [0], given: 0

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17 May 2008, 13:24
goalsnr wrote:
Is x negative ?
(1) n^3 [1-x^2]<0
(2) x^2-1 <0

Iam struggling with such kind of problems.I would appreciate if you help me understand teh basics here.

1) n^3 [1-x^2]<0 ;

In this either n <0 or (1-x^2)< 0 ; no information

2) x^2-1 <0

x=-0.5 or x=0.5 both satisfies the condition ;insuff

Together insufficient ; having information about x^2 does not really tell us anything about x
Intern
Joined: 26 Apr 2008
Posts: 49
Followers: 1

Kudos [?]: 2 [0], given: 0

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17 May 2008, 23:02
goalsnr wrote:
Is x negative ?
(1) n^3 [1-x^2]<0
(2) x^2-1 <0

Iam struggling with such kind of problems.I would appreciate if you help me understand teh basics here.

goalsnr, can you please confirm whether n in first statement is x or not ?
VP
Joined: 03 Apr 2007
Posts: 1366
Followers: 4

Kudos [?]: 458 [0], given: 10

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18 May 2008, 06:46
itsme291 wrote:
goalsnr wrote:
Is x negative ?
(1) n^3 [1-x^2]<0
(2) x^2-1 <0

Iam struggling with such kind of problems.I would appreciate if you help me understand teh basics here.

goalsnr, can you please confirm whether n in first statement is x or not ?

Yes I did confirm the stat1. Its correct. This question is from DS section 20(question #20)
CEO
Joined: 17 Nov 2007
Posts: 3580
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 484

Kudos [?]: 2794 [0], given: 359

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19 May 2008, 10:34
Expert's post
fast approach: both conditions include only x^2, so they are insensitive to +/-. Zero is not the case here, so E
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Re: DS-negative   [#permalink] 19 May 2008, 10:34
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