|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
bulletpoint
20 Oct 2013, 06:32
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
59% (00:47) correct
41%
(00:43)
wrong
based on 2450
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of x^2 - y^2?
(1) x + y = 2x
(2) x - y = 0
(1) x + y = 2x
(2) x - y = 0
Solving this question helps.
Taking a timed set of similar questions in
GMAT Club Forum Quiz →
is even better.
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
20 Oct 2013, 06:36
Kudos
Bookmarks
What is the value of x^2 - y^2?
\(x^2 - y^2=(x-y)(x+y)\)
(1) x + y = 2x --> re-arrange: \(x-y=0\) --> \((x-y)(x+y)=0\). Sufficient.
(2) x - y = 0 --> \(x-y=0\) --> \((x-y)(x+y)=0\). Sufficient.
Answer: D.
\(x^2 - y^2=(x-y)(x+y)\)
(1) x + y = 2x --> re-arrange: \(x-y=0\) --> \((x-y)(x+y)=0\). Sufficient.
(2) x - y = 0 --> \(x-y=0\) --> \((x-y)(x+y)=0\). Sufficient.
Answer: D.
27 May 2014, 09:11
Kudos
Bookmarks
Bunnuel, I have a hard time getting my approach clear on problems like that.
What made you rearrange statement (1) and not insert it in the q stem such as (2x)(x+y)?
What made you rearrange statement (1) and not insert it in the q stem such as (2x)(x+y)?
