What is the value of (x-y)^4 (1) The product of x and y is 7 : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 22 Jan 2017, 19:46

### 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-y)^4 (1) The product of x and y is 7

Author Message
SVP
Joined: 14 Dec 2004
Posts: 1702
Followers: 3

Kudos [?]: 137 [0], given: 0

What is the value of (x-y)^4 (1) The product of x and y is 7 [#permalink]

### Show Tags

09 Aug 2005, 10:34
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

What is the value of (x-y)^4

(1) The product of x and y is 7
(2) x and y are integers
Senior Manager
Joined: 30 May 2005
Posts: 276
Followers: 1

Kudos [?]: 35 [0], given: 0

### Show Tags

09 Aug 2005, 11:54
vivek123 wrote:
What is the value of (x-y)^4

(1) The product of x and y is 7
(2) x and y are integers

not sure i would say c

not sure

st 1 x*y=7
Many ways a product can gives 7
7*1
4/3*7/4

INS to find value of x and y

st2 x and y integers many choices possibles insufficient

together
we know both x and y are integer
since 7 IS a prime
x*y =7*1
plz correct me if i am wrong
what 's the OA?
THANKS
Senior Manager
Joined: 04 May 2005
Posts: 282
Location: CA, USA
Followers: 1

Kudos [?]: 51 [0], given: 0

### Show Tags

09 Aug 2005, 19:49
C

from 1) and 2) the two numbers have to be
-1, -7 or 1 , 7
SVP
Joined: 03 Jan 2005
Posts: 2243
Followers: 16

Kudos [?]: 325 [0], given: 0

### Show Tags

09 Aug 2005, 20:03
vivek123 wrote:
What is the value of (x-y)^4

(1) The product of x and y is 7
(2) x and y are integers

(x-y)^4=(x^2+y^2-2xy)^2
To know its value it will not be sufficient to know xy=7 or to know that both x and y are integers.

Combined we know that x and y can only be (1,7) or (-1,-7). (The order is not important.) The quadratic terms make the negative signs go away so the value of (x-y)^4 would be unique.

I agree with C.
_________________

Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.

Re: DS: Algebra   [#permalink] 09 Aug 2005, 20:03
Display posts from previous: Sort by

# What is the value of (x-y)^4 (1) The product of x and y is 7

 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®.