Concept: Absolute value "invalids" : DS Archive
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# Concept: Absolute value "invalids"

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CEO
Joined: 21 Jan 2007
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19 Nov 2007, 08:18
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|x-4| = x

looking at the positive scenario only

x-4=x
x=x+4
0=4 ???
VP
Joined: 08 Jun 2005
Posts: 1146
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Re: Concept: Absolute value "invalids" [#permalink]

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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
Joined: 01 May 2006
Posts: 1797
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Kudos [?]: 149 [0], given: 0

Re: Concept: Absolute value "invalids" [#permalink]

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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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