BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Is X negative?

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Senior | Next Rank: 100 Posts
Posts: 40
Joined: Mon Feb 16, 2009 8:50 pm
Thanked: 3 times

ans

by crackthetest » Mon Oct 19, 2009 7:23 pm
1) x^3 (1-x^2) < 0
x^3 < 0
1^2 - x^2 < 0
(1+x) (1-x) < 0
1<x or x<-1

x is -ve

A or D

2) x^2 - 1 < 0

x^2 - 1^2 < 0
(x+1) (x-1) < 0
x<1 or x<-1

(corrected)
indeterminant

Ans: A
Last edited by crackthetest on Tue Oct 20, 2009 5:45 am, edited 1 time in total.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 73
Joined: Sat Oct 03, 2009 10:37 pm

B is no good

by kiennguyen » Mon Oct 19, 2009 8:12 pm
IMO A
B: x^2 -1 < 0
equal: x^2 < 1 => -1<x<1. since x is not an integer, x may be - or +
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 407
Joined: Tue Jan 25, 2011 9:19 amFollowed by: 7 members
Thanked: 25 times

by Ozlemg » Fri Jul 22, 2011 5:38 am
No A is not sufficient as long as we do not know whether x is integer or fraction.

OA is C. Borh statements must be used together.

statement 1 is not sufficient
take example as 3 , -3
both satisfy the equation

statement 2 is not possible
anything ^ 2 will always be more than 0
whether it is -4 or 4
The more you suffer before the test, the less you will do so in the test! :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Junior | Next Rank: 30 Posts
Posts: 25
Joined: Fri Jul 22, 2011 5:09 am
Thanked: 1 times

by HeintzC2 » Thu Aug 04, 2011 10:49 am
Statement 2 actually states x^2 < 1 when decomposed.

Decomposing statement 1 we get x^3(1-x^2) < 0 = x^3 - x^5 < 0 = x^3 < x^5
for x^3 < x^5, x could be a positive value > 1 or a negative value > -1
insufficient.

Decomposing statement 2 we get x^2-1 < 0 = x^2 < 1.
for x^2 < 1 x can be -1 < x < 1.
insufficient.

Combining statements 1 & 2 we get;
From 1: x>1 OR 0>x>-1
AND
From 2: -1<x<1
Therefore, x must a negative value greater than -1 but less than 0.

Answer is C
Ozlemg wrote:No A is not sufficient as long as we do not know whether x is integer or fraction.

OA is C. Borh statements must be used together.

statement 1 is not sufficient
take example as 3 , -3
both satisfy the equation

statement 2 is not possible
anything ^ 2 will always be more than 0
whether it is -4 or 4
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 15539
Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members
Location: New York, NY
Thanked: 13060 times
GMAT Score:790

by GMATGuruNY » Thu Aug 04, 2011 1:25 pm
Pugalenthi wrote:OG 11th edition DS question:

Is X negative?

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

Please explain your response.
Statement 1: x³(1-x²)<0.
x=2:
2³(1-2²) < 0.
-24 < 0.

x= -1/2:
(-1/2)³(1- (-1/2)² )<0
(-1/8)(3/4) < 0
-3/32 < 0.

Since it's possible that x=2 or that x=-1/2, we cannot determine whether x<0.
Insufficient.

Statement 2: x² < 1.
x = 1/2:
(1/2)² < 1.
1/4 < 1.

x = -1/2:
(-1/2)² < 1.
1/4 < 1.

Since it's possible that x=1/2 or that x=-1/2, we cannot determine whether x<0.
Insufficient.

Statements 1 and 2:
Since x²-1 < 0, we know that 1-x² > 0.
Thus, statement 1 becomes x³ * positive < 0, implying that x³ < 0 and that x<0.
Sufficient.

The correct answer is C.
Private tutor exclusively for the GMAT and GRE, with over 20 years of experience.
Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.

As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.

For more information, please email me (Mitch Hunt) at [email protected].
Student Review #1
Student Review #2
Student Review #3
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1