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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 [#permalink] New post 17 May 2008, 07:26
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A
B
C
D
E

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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.
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Re: DS-negative [#permalink] New post 17 May 2008, 09:16
Assuming that n in first statement is x, is the ans C ?
Will explain if correct.
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Re: DS-negative [#permalink] New post 17 May 2008, 11:04
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] New post 17 May 2008, 12:24
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] New post 17 May 2008, 22:02
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 ?
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Re: DS-negative [#permalink] New post 18 May 2008, 05:46
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] New post 19 May 2008, 09:34
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, 09:34
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