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throw some light on the meaning..

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Current Student
Joined: 11 May 2008
Posts: 552
throw some light on the meaning.. [#permalink]

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12 Sep 2008, 06:28
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throw some light on the meaning...
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SVP
Joined: 07 Nov 2007
Posts: 1765
Location: New York

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12 Sep 2008, 22:12
arjtryarjtry wrote:
throw some light on the meaning...

say -x=y (positive)

$$sqrt(y|-y|)= sqrt(y^2)=y=-x$$
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Current Student
Joined: 11 May 2008
Posts: 552

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13 Sep 2008, 02:09
x2suresh wrote:
arjtryarjtry wrote:
throw some light on the meaning...

say -x=y (positive)

$$sqrt(y|-y|)= sqrt(y^2)=y=-x$$

sqrt(y^2)=+/-y . why have u not considered -y?
SVP
Joined: 17 Jun 2008
Posts: 1507

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15 Sep 2008, 00:21
arjtryarjtry wrote:
x2suresh wrote:
arjtryarjtry wrote:
throw some light on the meaning...

say -x=y (positive)

$$sqrt(y|-y|)= sqrt(y^2)=y=-x$$

sqrt(y^2)=+/-y . why have u not considered -y?

-y is not possible as y is negative.
Intern
Joined: 02 Sep 2008
Posts: 45

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15 Sep 2008, 08:32
Hi Suresh,

i agree till y = -x

but I think answer should be x.

as x < 0 so - ( -x ) = x.

Please give some points on this.
Re: GMAT PREP -4   [#permalink] 15 Sep 2008, 08:32
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throw some light on the meaning..

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