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

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Director
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Joined: 20 Sep 2006
Posts: 653

Kudos [?]: 135 [0], given: 7

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

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New post 03 Oct 2008, 17:02
00:00
A
B
C
D
E

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(N/A)

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Is x negative?

1) n^3(1-x^2) < 0
2) x^2 - 1 < 0

Kudos [?]: 135 [0], given: 7

Manager
Manager
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Joined: 22 Sep 2008
Posts: 121

Kudos [?]: 48 [0], given: 0

Re: DS confusing [#permalink]

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New post 03 Oct 2008, 19:12
E will be answer.

A: any term can be + or - ,ionsuff

B: x lies between -1 to 1 ,insuff

A+B.. (1-x^2) will be positive only , but X can have any values betweenn -1 to 1

E

Kudos [?]: 48 [0], given: 0

Manager
Manager
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Joined: 28 Apr 2008
Posts: 110

Kudos [?]: 12 [0], given: 0

Re: DS confusing [#permalink]

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New post 26 Nov 2008, 02:54
C

1--> insuff - if |x|<1 then -ve, and if |x|>1 +ve

2--> insuff -only tells us that -1<x<1

together--> 2 tells us that -1<x<1 --> |x|<1 -->combined with 1--
> n is negative--> sufficient

Kudos [?]: 12 [0], given: 0

Manager
Manager
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Joined: 05 Jul 2008
Posts: 136

Kudos [?]: 123 [0], given: 40

GMAT 2: 740 Q51 V38
Re: DS confusing [#permalink]

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New post 26 Nov 2008, 04:09
rino wrote:
C

1--> insuff - if |x|<1 then -ve, and if |x|>1 +ve

2--> insuff -only tells us that -1<x<1

together--> 2 tells us that -1<x<1 --> |x|<1 -->combined with 1--
> n is negative--> sufficient


The question is about x :X
E for me too.

Kudos [?]: 123 [0], given: 40

Director
Director
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Joined: 14 Aug 2007
Posts: 726

Kudos [?]: 211 [0], given: 0

Re: DS confusing [#permalink]

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New post 26 Nov 2008, 07:34
another E.

Both 1) & 2), even taken together, are not sufficient to confirm whether x is negative

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Intern
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Joined: 20 Sep 2008
Posts: 15

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Re: DS confusing [#permalink]

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New post 26 Nov 2008, 10:24
Answer E.
even with both statements together we cannot arrive at the answer.

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Manager
Manager
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Re: DS confusing [#permalink]

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New post 26 Nov 2008, 13:13
DavidArchuleta wrote:
rino wrote:
C

1--> insuff - if |x|<1 then -ve, and if |x|>1 +ve

2--> insuff -only tells us that -1<x<1

together--> 2 tells us that -1<x<1 --> |x|<1 -->combined with 1--
> n is negative--> sufficient


The question is about x :X
E for me too.


you're right- i thought the question was about n

thanks

Kudos [?]: 12 [0], given: 0

VP
VP
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Re: DS confusing [#permalink]

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New post 26 Nov 2008, 15:00
We get |x| > 1 from both A and B. Insufficient Together

Kudos [?]: 437 [0], given: 1

Manager
Manager
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Joined: 27 May 2008
Posts: 200

Kudos [?]: 45 [0], given: 0

Re: DS confusing [#permalink]

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New post 28 Nov 2008, 09:06
is this a correct question?

i think the Q should be

Is x negative?

1) x^3(1-x^2) < 0
2) x^2 - 1 < 0

i have similar Q some where in OG

Kudos [?]: 45 [0], given: 0

Re: DS confusing   [#permalink] 28 Nov 2008, 09:06
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Is x negative? 1) n^3(1-x^2) < 0 2) x^2 - 1 < 0

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