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

 It is currently 21 May 2013, 20:31

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

Author Message
TAGS:
Intern
Joined: 20 Feb 2012
Posts: 45
Followers: 0

Kudos [?]: 17 [0], given: 6

What is the value of (x - y)^4? [#permalink]  27 Feb 2012, 09:17
00:00

Question Stats:

80% (01:35) correct 20% (00:41) wrong based on 1 sessions
What is the value of (x - y)^4?

(1) The product of x and y is 7.
(2) x and y are integers.
[Reveal] Spoiler: OA
GMAT Club team member
Joined: 02 Sep 2009
Posts: 11534
Followers: 1795

Kudos [?]: 9564 [1] , given: 826

Re: What is the value [#permalink]  27 Feb 2012, 09:20
1
KUDOS
What is the value of (x - y)^4?

(1) The product of x and y is 7, well this one is clearly insufficient: if x=7 and y=1 then (x-y)^4=6^4 and if x=14 and y=\frac{1}{2} then (x-y)^4=(\frac{27}{2})^4, two different answers, hence not sufficient.

(2) x and y are integers. Also insufficient.

(1)+(2) As x and y are integers and xy=7 then either x and y are 1 and 7 (or vise-versa) or -1 and -7 (or vise-versa) in any case because of even power: (x-y)^4=(7-1)^4=(1-7)^4=(-7+1)^4=(-1+7)^4=6^4. Sufficient.

_________________
Intern
Joined: 18 Jun 2012
Posts: 38
GMAT Date: 09-17-2012
Followers: 2

Kudos [?]: 5 [0], given: 26

What is the value of (x-y)^4 ? [#permalink]  23 Jul 2012, 02:18
What is the value of (x-y)^4 ?

1. The product of x and y is 7.
2. x and y are integers.
GMAT Club team member
Joined: 02 Sep 2009
Posts: 11534
Followers: 1795

Kudos [?]: 9564 [0], given: 826

Re: What is the value of (x-y)^4 ? [#permalink]  23 Jul 2012, 02:26
ananthpatri wrote:
What is the value of (x-y)^4 ?

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

Merging similar topics. Please refer to the solution above.
_________________
Re: What is the value of (x-y)^4 ?   [#permalink] 23 Jul 2012, 02:26
Similar topics Replies Last post
Similar
Topics:
What is the value of (x-y)^4 (1) The product of x and y is 7 3 09 Aug 2005, 11:34
What is the value of (x-y)^4? 4 24 Dec 2008, 15:03
What is the value of (x - y)^4 ? (1) The product of 7 15 Oct 2009, 15:58
What is the value of (x + y)^4 ? (1) The product of 6 17 Oct 2009, 23:27
1 What is the value of (x - y)^4 ? (1) The product of 3 07 Nov 2009, 05:02
Display posts from previous: Sort by