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# Short cut for this question

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VP
Joined: 18 May 2008
Posts: 1201
Short cut for this question [#permalink]

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20 Jan 2009, 10:30
If r = (3p+q)/2 and s = p – q, for which of the following values of p would r^2 = s^2 ?

(A) q/5
(B) 10 –3q/2
(C) q – 1
(D) 3q
(E) 9q/2 – 9

I got the answer right, but any1 tell the short cut to this question where we dnt hv 2 expand the equation and all?

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GMAT Tutor
Joined: 24 Jun 2008
Posts: 1346
Re: Short cut for this question [#permalink]

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20 Jan 2009, 10:38
1
KUDOS
Expert's post
Well, there's no need to expand anything; if r^2 = s^2, then r = s or r = -s, so that's all you need to check.
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Manager
Joined: 02 Sep 2008
Posts: 103
Re: Short cut for this question [#permalink]

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20 Jan 2009, 15:31
I followed the method given above and it didn't took me much time to get to the answer A.

Please let us know if I am rite.
VP
Joined: 18 May 2008
Posts: 1201
Re: Short cut for this question [#permalink]

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20 Jan 2009, 21:29
Oh yes ..thats a nice short cut. Thanks

+1 frm me
IanStewart wrote:
Well, there's no need to expand anything; if r^2 = s^2, then r = s or r = -s, so that's all you need to check.

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Short cut for this question   [#permalink] 20 Jan 2009, 21:29
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# Short cut for this question

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