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

 It is currently 23 May 2013, 23:16

# What is the value of a^4 - b^4 ? I - a^2 - b^2 = 16 II

Author Message
TAGS:
Manager
Joined: 21 Mar 2005
Posts: 115
Location: Basel
Followers: 1

Kudos [?]: 2 [0], given: 0

What is the value of a^4 - b^4 ? I - a^2 - b^2 = 16 II [#permalink]  25 Nov 2005, 09:43
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
What is the value of a^4 - b^4 ?

I - a^2 - b^2 = 16
II - a + b = 8

Looks obvious at the first look but....
Manager
Joined: 15 Aug 2005
Posts: 138
Followers: 1

Kudos [?]: 4 [0], given: 0

Re: PS - Number properties [#permalink]  25 Nov 2005, 15:28
tobiastt wrote:
What is the value of a^4 - b^4 ?

I - a^2 - b^2 = 16
II - a + b = 8

Looks obvious at the first look but....

It should be C

i) a^2 - b^2=16
=> (a - b) (a + b)=16 --> insuff

ii) a+b =8 --> insuff

from i and ii => a - b = 2
so a=5 & b=3

so the ans should be C
Re: PS - Number properties   [#permalink] 25 Nov 2005, 15:28
Similar topics Replies Last post
Similar
Topics:
What is the value of a^4-b^4? 1) a^2 - b^2 = 16 2) a + b = 8 4 23 Dec 2004, 00:32
If xy = 1, what is the value of /? a) 2 b) 4 c) 8 d) 16 e) 1 25 Dec 2005, 16:34
What is the value of a^4 - b^4 ? 1) a^2 - b^2 = 16 2) a+b = 2 22 Dec 2006, 09:20
What is the value of a^4 - b^4? (1) a^2 - b^2 = 16 (2) a + b 6 23 Aug 2007, 17:55
What is the value of a^4 - b^4? 1) a^2 - b^2 = 16 2) a + b = 3 25 Nov 2007, 16:06
Display posts from previous: Sort by