Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 05 Jul 2015, 00:16

### 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
TAGS:
SVP
Joined: 14 Dec 2004
Posts: 1706
Followers: 1

Kudos [?]: 58 [0], given: 0

What is the value of (x-y)^4 (1) The product of x and y is 7 [#permalink]  09 Aug 2005, 10:34
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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: 277
Followers: 1

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

Re: DS: Algebra [#permalink]  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: 284
Location: CA, USA
Followers: 1

Kudos [?]: 23 [0], given: 0

C

from 1) and 2) the two numbers have to be
-1, -7 or 1 , 7
SVP
Joined: 03 Jan 2005
Posts: 2246
Followers: 13

Kudos [?]: 226 [0], given: 0

Re: DS: Algebra [#permalink]  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
Similar topics Replies Last post
Similar
Topics:
1 What is the value of (x - y)^4? (1) The product of x and y 5 20 Aug 2009, 04:45
What is the value of (x-y)^4? 4 24 Dec 2008, 14:03
What is the value of (x-y)^4? 1) the product of x and y is 7 2 09 May 2008, 03:51
What is the value of (x - y)^4? (1) The product of x and y 7 24 Apr 2006, 01:04
What is the value of (x - y)^4? (1) The product of x and y 1 08 Oct 2005, 14:10
Display posts from previous: Sort by