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

Oldest

Best Reply

Author

Message

TAGS:

Senior Manager

Joined: 22 Aug 2003

Posts: 262

Location: Bangalore

Followers: 1

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

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

06 Oct 2003, 02:10

00:00

Question Stats:

0% (00:00) correct

0% (00:00) wrong

based on 0 sessions

20. Is x negative ?
(1) n^3*(1-x^2) < 0
(2) x^2 -1 <0
another one where i disagree with official answer.. :oops:

please explain

CEO

Joined: 15 Aug 2003

Posts: 3550

Followers: 55

Kudos [?]: 626 [0], given: 781

Re: DS: is x negative [#permalink]

06 Oct 2003, 02:46

Vicky wrote:

20. Is x negative ?
(1) n^3*(1-x^2) < 0
(2) x^2 -1 <0
another one where i disagree with official answer.. :oops:

please explain

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

1-x^2 > 0 ...that is true for this inequality to hold true

x^2 < 1

x can be between -1 and 1..not sufficient

(2) x^2 -1 <0

x^2 <1 ..x has to be between -1 and 1..so insufficient..

Combine....nothin we dont know

I think E.

thanks
praetorian

Manager

Joined: 27 Jul 2003

Posts: 132

Location: Singapore

Followers: 1

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

[#permalink]

06 Oct 2003, 03:39

form stat1. x is between -1 and 1 for both +ve and -ve values of n. (insuff)
stat. ===> x is between -1 and 1. (isuff)
combining still the same.

I agree with Houston. Vote for E.

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

09 Jan 2004, 07:43

A is not sufficient because we dont anything about n
B is not sufficient.

(x^2-1) < 0 means
(x-1) * (x+1 ) < 0
if x = -0.5 we have a -ve result and
if x = 0.5 we have a -ve result.
So we cannot tell from B either

If we combine A and B
X^2 -1 < 0 is same as X^2 < 1 then
1-X^2 will be -ve. Again we dont know anyting about N here
So C is not the answer.

E has to be the answer.

Joined: 13 Nov 2003

Posts: 1031

Location: Florida

Followers: 1

Kudos [?]: 5 [0], given: 0

[#permalink]

09 Jan 2004, 08:15

from each of the statements, we get x^2<1
not suff.

should be E

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

09 Jan 2004, 08:40

Hi DJ,

You are never satisfied with one icon in your profile are you?

Joined: 13 Nov 2003

Posts: 1031

Location: Florida

Followers: 1

Kudos [?]: 5 [0], given: 0

[#permalink]

09 Jan 2004, 09:04

anandnk wrote:

Hi DJ,

You are never satisfied with one icon in your profile are you?

people were scared of my scopion..I had to change

Director

Joined: 28 Oct 2003

Posts: 533

Location: 55405

Followers: 1

Kudos [?]: 4 [0], given: 0

[#permalink]

09 Jan 2004, 09:08

Quote:

people were scared of my scopion..I had to change

I thought it was a lobster!

Joined: 13 Nov 2003

Posts: 1031

Location: Florida

Followers: 1

Kudos [?]: 5 [0], given: 0

[#permalink]

09 Jan 2004, 09:12

stoolfi wrote:

Quote:

people were scared of my scopion..I had to change

I thought it was a lobster!

haha..!
think, u are spending too much time at the "Red Lobster"

scorp..my sunsign.

SVP

Joined: 30 Oct 2003

Posts: 1963

Location: NewJersey USA

Followers: 3

Kudos [?]: 25 [0], given: 0

[#permalink]

09 Jan 2004, 09:14

Has to be scorpion because there is no lobster sun sign. Looks like a data sufficiency discussion. :lol:

Not sure if chinese sun signs have anything like lobster
So I will stick with E

[#permalink] 09 Jan 2004, 09:14

		Similar topics	Author	Replies	Last post
Similar Topics:		Is x negative? 1) x^3(1-x^2)<0 2) x^2-1<0	yezz	3	10 Oct 2006, 13:31
		Is x negative? (1) x^3(1-x^2) < 0 (2) x^2 - 1 < 0	above720	10	23 Aug 2007, 19:12
	1	Is x negative? 1. x^3(1-x^2)<0 2. x^2-1<0	vksunder	9	17 Jun 2008, 19:05
	1	Is x negative? 1) x^3(1-x^2)<0 2) x^2-1<0	I3igDmsu	4	21 Jun 2009, 18:59
		Is x negative? 1) x^3(1-x^2)<0 2) x^2-1<0	yezz	4	16 Aug 2009, 00:43

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

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

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

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

Main navigation

GMAT Resources

Partners

MBA Resources