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chipbmk
 Post subject: Question from a practice exam
PostPosted: Wed Sep 23, 2009 2:58 pm 
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Joined: Mon Aug 24, 2009 11:40 am
Posts: 2
In a practice exam that I took recently, I got the following data sufficiency question:

What is the value of p^3 - q^3?

1) p-q=0
2) p+q=0

How do you answer this question? More specifically, how do you reduce p^3 - q^3?

Thank you very much.
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VP_Help
 Post subject: Re: Question from a practice exam
PostPosted: Wed Sep 23, 2009 5:33 pm 
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Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
We don't need to factor the question stem.

from (1), p = q, so p^3 - q^3 = 0

-- Veritas Help
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Vanilla
 Post subject: Re: Question from a practice exam
PostPosted: Mon Nov 16, 2009 9:08 am 
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Joined: Fri Jul 10, 2009 7:57 am
Posts: 2
Hi

So for S2: p + q = 0

it would be p = -q, hence, -q^3 - q^3 = -2q^3

Is this correct?
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