Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 29 Aug 2016, 00:14

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the value of x?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Intern
Joined: 27 Feb 2012
Posts: 37
Followers: 1

Kudos [?]: 18 [0], given: 5

What is the value of x? [#permalink]

### Show Tags

18 Dec 2012, 22:59
1
This post was
BOOKMARKED
00:00

Difficulty:

35% (medium)

Question Stats:

68% (01:38) correct 32% (00:51) wrong based on 78 sessions

### HideShow timer Statistics

What is the value of x?

(1) $$x^3 - x^2 = 0$$
(2) $$(-x)^2 = -x^2$$
[Reveal] Spoiler: OA

Last edited by jsphcal on 19 Dec 2012, 08:12, edited 1 time in total.
Moderator
Joined: 02 Jul 2012
Posts: 1230
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Followers: 110

Kudos [?]: 1255 [1] , given: 116

Re: What is the value of x? [#permalink]

### Show Tags

18 Dec 2012, 23:34
1
KUDOS
jsphcal wrote:
What is the value of x?

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

(2) (-x)^2 = -x^2

1) x can be either 0 or 1. Insufficient.

2) Lets say $$x^2 = a$$. We are given a = -a. So, a can only be 0 and hence x can only be 0.

_________________

Did you find this post helpful?... Please let me know through the Kudos button.

Thanks To The Almighty - My GMAT Debrief

GMAT Reading Comprehension: 7 Most Common Passage Types

Manager
Joined: 08 Apr 2012
Posts: 129
Followers: 11

Kudos [?]: 87 [1] , given: 14

Re: What is the value of x? [#permalink]

### Show Tags

19 Dec 2012, 02:39
1
KUDOS
jsphcal wrote:
What is the value of x?

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

(2) (-x)^2 = -x^2

In this case, it is better to simplify. This is a "value" question, so our answer depends on finding the exact value of x.

(1)

$$x^3-x^2=0$$
$$x^2(x-1)=0$$
=> either x=0 or x=1
INSUFFICIENT

(2)

$$(-x)^2 = -x^2$$
Simplifying left hand side,

$$(-x)^2 = (-1*x)^2 = (-1)^2 * (x)^2 = x^2$$

Thus the original expression is reduced to $$x^2=-x^2$$, which can only happen when x=0.
SUFFICIENT

Thus the answer is B.
_________________

Shouvik
http://www.Edvento.com

Math Expert
Joined: 02 Sep 2009
Posts: 34476
Followers: 6288

Kudos [?]: 79790 [1] , given: 10022

Re: What is the value of x? [#permalink]

### Show Tags

19 Dec 2012, 02:44
1
KUDOS
Expert's post
What is the value of x?

(1) x^3 - x^2 = 0 --> $$x^2(x-1)=0$$ --> $$x=0$$ or $$x=1$$. Not sufficient.

(2) (-x)^2 = -x^2 --> $$x^2=-x^2$$ --> $$2x^2=0$$ --> $$x=0$$. Sufficient.

_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 11119
Followers: 511

Kudos [?]: 134 [0], given: 0

Re: What is the value of x? [#permalink]

### Show Tags

29 Jan 2016, 06:00
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: What is the value of x?   [#permalink] 29 Jan 2016, 06:00
Similar topics Replies Last post
Similar
Topics:
12 What is the value of x? 40 30 May 2010, 02:52
3 What is the value of x + 7 ? 14 13 May 2010, 10:36
7 What is the value of x? 6 11 Jan 2010, 06:41
4 What is the value of x/yz? 9 08 Mar 2009, 19:28
5 What is the value of x? 9 19 Nov 2007, 16:30
Display posts from previous: Sort by

# What is the value of x?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.