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can somone crack..

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Manager
Manager
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Joined: 18 Jul 2009
Posts: 168

Kudos [?]: 114 [0], given: 37

Location: India
Schools: South Asian B-schools
can somone crack.. [#permalink]

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New post 24 Jul 2009, 13:53
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Bhushan S.
If you like my post....Consider it for Kudos :-D

Kudos [?]: 114 [0], given: 37

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Joined: 05 Jul 2006
Posts: 1742

Kudos [?]: 418 [0], given: 49

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Re: DS - Number system [#permalink]

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New post 24 Jul 2009, 14:05
bhushan252 wrote:
can somone crack...



/x+2/ = 4 ie: square both sides x^2+4x-12 = 0

(x+6)(x-2) = 0 ie x is either -6 or 2

from 1

x^2 not = 4 thus x is impossible to = -2 or 2......thus x =-6 suff...

from 2

x^2 = 36 ie x is either 6 or -6 and impossible to be 2....thus it has to be =-6..........suff

D

Kudos [?]: 418 [0], given: 49

Director
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Joined: 03 Jun 2009
Posts: 784

Kudos [?]: 885 [0], given: 56

Location: New Delhi
WE 1: 5.5 yrs in IT
Re: DS - Number system [#permalink]

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New post 26 Jul 2009, 07:57
yezz wrote:
/x+2/ = 4 ie: square both sides x^2+4x-12 = 0

(x+6)(x-2) = 0 ie x is either -6 or 2


just another way to deduce this:
Given:
|x+2| = 4

when (x+2) is -ve
=> -(x+2) = 4
or x = -6

when (x+2) i s+ve
=> x +2 = 4
or x = 2

Hence x is either -6 or 2
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Kudos [?]: 885 [0], given: 56

Re: DS - Number system   [#permalink] 26 Jul 2009, 07:57
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