It is currently 20 Jun 2019, 11:56
My Tests

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.

x > 0 > y

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
GRE Prep Club Legend
GRE Prep Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4810
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 118

Kudos [?]: 1899 [1] , given: 397

x > 0 > y [#permalink] New post 30 Aug 2018, 16:29
1
This post received
KUDOS
Expert's post
00:00

Question Stats:

65% (00:59) correct 34% (00:40) wrong based on 43 sessions
\(x > 0 > y\)

Quantity A
Quantity B
\(x - y\)
\((x + y)^{2}\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1995
Followers: 60

Kudos [?]: 1811 [0], given: 9

CAT Tests
Re: x > 0 > y [#permalink] New post 31 Aug 2018, 09:13
Expert's post
sandy wrote:
\(x > 0 > y\)

Quantity A
Quantity B
\(x - y\)
\((x + y)^{2}\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


I can't think of any useful algebraic manipulations that will help me, so let's test some possible cases...

ASIDE: The given information tells us that x is POSITIVE and y is NEGATIVE

Case 1: x = 1 and y = -1
We get:
QUANTITY A: x - y = 1 - (-1) = 2
QUANTITY B: (x + y)² = (1 + -1)² = 0² = 0
In this case, Quantity A is greater

Case 2: x = 10 and y = -1
We get:
QUANTITY A: x - y = 10 - (-1) = 11
QUANTITY B: (x + y)² = (10 + -1)² = 9² = 81
In this case, Quantity B is greater

Answer: D

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for my free GRE Question of the Day emails

Manager
Manager
Joined: 29 Nov 2017
Posts: 190
Location: United States
GRE 1: Q142 V146
WE: Information Technology (Computer Software)
Followers: 0

Kudos [?]: 79 [0], given: 99

Re: x > 0 > y [#permalink] New post 01 Sep 2018, 07:11
GreenlightTestPrep wrote:
sandy wrote:
\(x > 0 > y\)

Quantity A
Quantity B
\(x - y\)
\((x + y)^{2}\)


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.


I can't think of any useful algebraic manipulations that will help me, so let's test some possible cases...

ASIDE: The given information tells us that x is POSITIVE and y is NEGATIVE

Case 1: x = 1 and y = -1
We get:
QUANTITY A: x - y = 1 - (-1) = 2
QUANTITY B: (x + y)² = (1 + -1)² = 0² = 0
In this case, Quantity A is greater

Case 2: x = 10 and y = -1
We get:
QUANTITY A: x - y = 10 - (-1) = 11
QUANTITY B: (x + y)² = (10 + -1)² = 9² = 81
In this case, Quantity B is greater

Answer: D

Cheers,
Brent


I expanded option B and equated to A(LHS) and the LHS went 0 and then the whole equation stopped making sense and chooce D.

I am wondering why did you not expanded x+y whole square equation?
1 KUDOS received
GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1995
Followers: 60

Kudos [?]: 1811 [1] , given: 9

CAT Tests
Re: x > 0 > y [#permalink] New post 03 Sep 2018, 05:26
1
This post received
KUDOS
Expert's post
[/quote]

I expanded option B and equated to A(LHS) and the LHS went 0 and then the whole equation stopped making sense and chooce D.

I am wondering why did you not expanded x+y whole square equation?[/quote]

Let's see what happens if we expand

Given:
QUANTITY A: x - y
QUANTITY B: (x + y)²

Expand Quantity B to get:
QUANTITY A: x - y
QUANTITY B: x² + 2xy + y²

Now what can we do?

Whatever we do from here seems more likely to make matters more confusing.
For example, we COULD add y to both quantities to get:
QUANTITY A: x
QUANTITY B: x² + 2xy + y + y²
This doesn't help.

What if we subtract x from both quantities? We get:
QUANTITY A: 0
QUANTITY B: x² + 2xy + y - x + y²
Yikes!!

At this point, we should probably start considering a different approach.

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com
Image
Sign up for my free GRE Question of the Day emails

Intern
Intern
Joined: 21 Mar 2019
Posts: 10
Followers: 0

Kudos [?]: 6 [0], given: 11

Re: x > 0 > y [#permalink] New post 25 Mar 2019, 18:17
The statement say: y < 0 < x

I will pick two numbers and test:

Case 1: x=10, y=-3


Quantity A
x-y =
10-(-3)=
13

Quantity B
(x+y)^2=
(10-3)^2
49

Therefore, B > A

Case 2: x=1/4, y=-1/2

Quantity A
x-y =
1/4 - (-1/2)=
3/4

Quantity B
(x+y)^2=
(1/4-1/2)^2
1/4

Therefore, A > B

So Answer: D
_________________

Diana

If you found this post useful, please let me know by pressing the Kudos Button

Re: x > 0 > y   [#permalink] 25 Mar 2019, 18:17
Display posts from previous: Sort by

x > 0 > y

  Question banks Downloads My Bookmarks Reviews Important topics  


GRE Prep Club Forum Home| About| Terms and Conditions and Privacy Policy| GRE Prep Club Rules| Contact

Powered by phpBB © phpBB Group

Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.