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

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

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.

Manager

Joined: 26 Apr 2008

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Re: DS-negative [#permalink]

17 May 2008, 10:16

Assuming that n in first statement is x, is the ans C ?
Will explain if correct.

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Re: DS-negative [#permalink]

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.

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Re: DS-negative [#permalink]

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.

I think answer is E

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

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Re: DS-negative [#permalink]

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 ?

Joined: 03 Apr 2007

Posts: 1384

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Re: DS-negative [#permalink]

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)

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Re: DS-negative [#permalink]

19 May 2008, 10:34

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

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

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