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# Concept: Absolute value "invalids"

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CEO
Joined: 21 Jan 2007
Posts: 2764
Location: New York City
Followers: 9

Kudos [?]: 349 [0], given: 4

Concept: Absolute value "invalids" [#permalink]  19 Nov 2007, 08:18
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Question Stats:

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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: 1147
Followers: 6

Kudos [?]: 128 [0], given: 0

Re: Concept: Absolute value "invalids" [#permalink]  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: 1805
Followers: 8

Kudos [?]: 99 [0], given: 0

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