GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 11 Dec 2018, 05:34

R1 Decisions:

HBS Chat - Decisions will be released at Noon ET  |  UVA Darden Chat  |  YouTube Live with Cornell Johnson @11am ET


Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • Free GMAT Prep Hour

     December 11, 2018

     December 11, 2018

     09:00 PM EST

     10:00 PM EST

    Strategies and techniques for approaching featured GMAT topics. December 11 at 9 PM EST.
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6

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

Hide Tags

Board of Directors
User avatar
P
Joined: 01 Sep 2010
Posts: 3292
What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 27 Jul 2017, 07:09
3
Top Contributor
12
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

70% (01:17) correct 30% (01:25) wrong based on 400 sessions

HideShow timer Statistics

Math Expert
User avatar
V
Joined: 02 Aug 2009
Posts: 7099
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 27 Jul 2017, 08:14
2
1
carcass wrote:
What is the value of \(x^2 - y^2\) ?


(1) \((x - y)^2 = 9\)

(2) x + y = 6




\(x^2-y^2=(x+y)(x-y)\)

STATEMENTS..

(1) \((x - y)^2 = 9\)
x-y= 3..
x-y=-3..
various combinations of x and y possible fitting in any of two above
insuff

(2) x + y = 6
we do not know what is x-y
insuff

combined..
we know x+y=6..
but x-y can be 3, then ans is 18
OR x-y can be -3 ans will be -18

insuff

E
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


GMAT online Tutor

Senior Manager
Senior Manager
avatar
S
Joined: 29 Jun 2017
Posts: 405
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 06 Aug 2017, 06:50
1
lets consider both case 1 and 2

x=6-y

(6-y-y)^2=9
6-2y=3 or -3
we can have two values of y and x

so, not sufficient

e
Intern
Intern
avatar
B
Joined: 08 May 2018
Posts: 25
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 31 Jul 2018, 07:03
What is the value of \(x^2 - y^2\)?

(1) \((x-y)^2=9\)
(2) \(x+y=6\)
Director
Director
User avatar
P
Joined: 31 Oct 2013
Posts: 852
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 31 Jul 2018, 07:11
throw123 wrote:
What is the value of \(x^2 - y^2\)?

(1) \((x-y)^2=9\)
(2) \(x+y=6\)



\(x^2 - y^2 = (x+y) (x - y)\)

Statement 1 :

\((x-y)^2 = 9\)

x - y = +3 or -3

At the same time we don't know about x-y

NOT sufficient.

Statement 2 :

x + y = 6.

No information regarding x - y .Not sufficient.

1+ 2:

As we have 2 values for x - y , it's not possible to find out any specific value of \(x^2 - y^2\)

The best answer is E.
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 51098
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6  [#permalink]

Show Tags

New post 31 Jul 2018, 08:41
GMAT Club Bot
Re: What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6 &nbs [#permalink] 31 Jul 2018, 08:41
Display posts from previous: Sort by

What is the value of x^2 − y^2 ? (1) (x - y)^2 = 9 (2) x + y = 6

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.