|
|
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.
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
43% (02:00) correct
57%
(01:55)
wrong
based on 47
sessions
History
Date
Time
Result
Not Attempted Yet
Archit3110
Major Poster
01 Nov 2021, 10:55
Kudos
Bookmarks
target
Is x^2 - y^2 greater than x - y
x^2-y^2-x+y>0
#1
x-y<0
possible when
x=1 , y=-2
we get no to target
x=-3, y=-1
we get yes to target
insufficient
#2
x + y < 0
same case as #1
x=1 , y=-2
we get no to target
x=-3, y=-1
we get yes to target
from 1 &2
nothing in common
option E
Is x^2 - y^2 greater than x - y
x^2-y^2-x+y>0
#1
x-y<0
possible when
x=1 , y=-2
we get no to target
x=-3, y=-1
we get yes to target
insufficient
#2
x + y < 0
same case as #1
x=1 , y=-2
we get no to target
x=-3, y=-1
we get yes to target
from 1 &2
nothing in common
option E
IdanGolan
01 Nov 2021, 11:50
Kudos
Bookmarks
Asked: Is x^2 - y^2 greater than x - y?
Is x^2 - y^2 = (x-y)(x+y) > x-y
Is (x-y)(x+y-1) > 0
(1) x - y < 0
If x+y-1 > 0; (x-y)(x+y-1) <0
But if x+y-1 < 0; (x-y)(x+y-1) >0
NOT SUFFICIENT
(2) x + y < 0
x + y - 1 < 0
If x-y > 0; (x-y)(x+y-1) <0
But if x-y < 0; (x-y)(x+y-1) >0
NOT SUFFICIENT
(1) + (2)
(1) x - y < 0
(2) x + y < 0
x + y - 1 < 0
(x-y)(x+y-1) >0
SUFFICIENT
IMO C
Is x^2 - y^2 = (x-y)(x+y) > x-y
Is (x-y)(x+y-1) > 0
(1) x - y < 0
If x+y-1 > 0; (x-y)(x+y-1) <0
But if x+y-1 < 0; (x-y)(x+y-1) >0
NOT SUFFICIENT
(2) x + y < 0
x + y - 1 < 0
If x-y > 0; (x-y)(x+y-1) <0
But if x-y < 0; (x-y)(x+y-1) >0
NOT SUFFICIENT
(1) + (2)
(1) x - y < 0
(2) x + y < 0
x + y - 1 < 0
(x-y)(x+y-1) >0
SUFFICIENT
IMO C
