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What is the value of |x|? (1) x = -|x| (2) x^2 = 4

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Director
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Joined: 20 Sep 2006
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What is the value of |x|? (1) x = -|x| (2) x^2 = 4 [#permalink] New post 11 Aug 2008, 18:00
What is the value of |x|?
(1) x = -|x|
(2) x^2 = 4
Director
Director
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Re: mod of X [#permalink] New post 11 Aug 2008, 18:13
rao_1857 wrote:
What is the value of |x|?
(1) x = -|x|
(2) x^2 = 4


(1) Insufficient

x can be 0 or any negative number

(2) Insufficient

x = 2 or -2

1 & 2 Sufficient

x = -2
Manager
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Re: mod of X [#permalink] New post 11 Aug 2008, 18:33
rao_1857 wrote:
What is the value of |x|?
(1) x = -|x|
(2) x^2 = 4


Q stem is asking for |x|. So, B
Director
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Re: mod of X [#permalink] New post 11 Aug 2008, 18:35
zoinnk wrote:
rao_1857 wrote:
What is the value of |x|?
(1) x = -|x|
(2) x^2 = 4


(1) Insufficient

x can be 0 or any negative number

(2) Insufficient

x = 2 or -2

1 & 2 Sufficient

x = -2



good point, for some reason I ignored the -ve numbers and thought x =0.
thanks for clarifying

FYI ... quest is asking mod X so B itself is suff
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Re: mod of X [#permalink] New post 11 Aug 2008, 19:43
rao_1857 wrote:
What is the value of |x|?
(1) x = -|x|
(2) x^2 = 4


1) x=-|x|
---> |x| = -x
we don't the value of X.. it can be any hting..positive or negative values

In sufficient

2) |x|=2
sufficient

B
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Manager
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Re: mod of X [#permalink] New post 11 Aug 2008, 22:50
IMO B

x^2=4
which gives
x=+/- 2

in any case |x|=2
Re: mod of X   [#permalink] 11 Aug 2008, 22:50
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What is the value of |x|? (1) x = -|x| (2) x^2 = 4

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