What is the Value of (a-b)? : GMAT Data Sufficiency (DS)
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# What is the Value of (a-b)?

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Intern
Joined: 29 Mar 2010
Posts: 40
Location: Leeds
Schools: SBS, JBS(ding w/o interview), HEC
WE 1: SCI-12 yrs
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Kudos [?]: 11 [0], given: 5

What is the Value of (a-b)? [#permalink]

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04 May 2010, 05:24
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Difficulty:

55% (hard)

Question Stats:

62% (01:55) correct 38% (01:15) wrong based on 14 sessions

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What is the Value of (a-b)?

(1) $$a2 - b2=9$$
(2) $$a2-2ab+b2=1$$
[Reveal] Spoiler: OA
Senior Manager
Joined: 30 Aug 2009
Posts: 286
Location: India
Concentration: General Management
Followers: 3

Kudos [?]: 156 [0], given: 5

Re: What is the Value of (a-b)? [#permalink]

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04 May 2010, 07:10
ajitsah wrote:
Data Dufficiency Problem.

What is the Value of (a-b)?
1.$$a2 - b2=9$$
2.$$a2-2ab+b2=1$$

I don't agree.

stmnt1 - $$a2 - b2=9$$ => (a-b)(a+b) = 9 => we don't have value of (a+b) so we can't find (a-b). hence insuff
stmnt2 - (a-b)^2 = 1 so (a-b) is either +1 or -1. hence insuff

taking together we have (a-b) as +1 or -1 and (a-b)(a+b) = 9 which is not sufficient. so E
Re: What is the Value of (a-b)?   [#permalink] 04 May 2010, 07:10
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