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# GMATprep DS Sqaure

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Manager
Joined: 26 Jun 2007
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10 Nov 2007, 01:17
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This topic is locked. If you want to discuss this question please re-post it in the respective forum.

I simplified question stem and arrived to:

Is X = 3?

1. I can't see why X !=3 is not sufficient
2. I can't understand (2)...

thanks ,Guy
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GMATprep_DS_Square.jpg [ 3.54 KiB | Viewed 541 times ]

VP
Joined: 08 Jun 2005
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10 Nov 2007, 04:37
For any x ---> sqrt(x^2) = |x|

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

statement 1

insufficient

statement 2

this will tells you that x is negative since |x| is positive and -(-n) is positive.

sufficient

SVP
Joined: 29 Aug 2007
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10 Nov 2007, 22:59
GGUY wrote:
I simplified question stem and arrived to:

Is X = 3?

1. I can't see why X !=3 is not sufficient
2. I can't understand (2)...

thanks ,Guy

From 1, x could be > or < 3.
from 2, x is only -ve. so it is suficient to answer than the equation holds true.
Manager
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KillerSquirrel isn't the formula true for every x<=3 ? [#permalink]

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11 Nov 2007, 08:34
Quote:

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

KillerSquirrel, from my calculations i gather that the formula is true for every x<=3.

(try x=3, x=2,x=1, x=0), it still means you are correct of course.
the OA is B.

please tell me how did you arrive to those values, perhaps it's my bad.

i'll be happy to know in general how you solve absolute values questions.

thanks Guy
VP
Joined: 08 Jun 2005
Posts: 1146
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Kudos [?]: 189 [0], given: 0

Re: KillerSquirrel isn't the formula true for every x<=3 [#permalink]

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11 Nov 2007, 11:02
GGUY wrote:
Quote:

is |x-3| = 3-x ?

this will be true when x=3 or x<=0

KillerSquirrel, from my calculations i gather that the formula is true for every x<=3.

(try x=3, x=2,x=1, x=0), it still means you are correct of course.
the OA is B.

please tell me how did you arrive to those values, perhaps it's my bad.

i'll be happy to know in general how you solve absolute values questions.

thanks Guy

Of course you are right ---> x <= 3

But this dosen't change the answer since x<0 is still in the range and x <> 3 can be anything (i.e 4 ---> out of range).

About solving absolute values questions ---> see attachment
Attachments

Absolute Value.pdf [82.34 KiB]

Re: KillerSquirrel isn't the formula true for every x<=3   [#permalink] 11 Nov 2007, 11:02
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