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Concept: Absolute value "invalids"

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CEO
CEO
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Joined: 21 Jan 2007
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Location: New York City
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Concept: Absolute value "invalids" [#permalink] New post 19 Nov 2007, 08:18
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Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
|x-4| = x

looking at the positive scenario only

x-4=x
x=x+4
0=4 ???
VP
VP
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Joined: 08 Jun 2005
Posts: 1157
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Re: Concept: Absolute value "invalids" [#permalink] New post 19 Nov 2007, 09:29
bmwhype2 wrote:
|x-4| = x

looking at the positive scenario only

x-4=x
x=x+4
0=4 ???


Only one scenario here x=2

:)
SVP
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Joined: 01 May 2006
Posts: 1818
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GMAT Tests User
Re: Concept: Absolute value "invalids" [#permalink] New post 19 Nov 2007, 09:54
bmwhype2 wrote:
|x-4| = x

looking at the positive scenario only

x-4=x
x=x+4
0=4 ???


That means there is no solution for x >= 4 (as |x-4| = x-4 when x>=4). :)
Re: Concept: Absolute value "invalids"   [#permalink] 19 Nov 2007, 09:54
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Concept: Absolute value "invalids"

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