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GMATprep DS Sqaure

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GGUY
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GMATprep DS Sqaure [#permalink] New post   10 Nov 2007, 02:17
00:00
A
B
C
D
E

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(N/A)

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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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Re: GMATprep DS Sqaure [#permalink] New post   10 Nov 2007, 05:37
For any x ---> sqrt(x^2) = |x|

so you are being asked:

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

the answer is (B)

:)
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Re: GMATprep DS Sqaure [#permalink] New post   10 Nov 2007, 23:59
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.
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Re: GMATprep DS Sqaure [#permalink] New post   11 Nov 2007, 09:34
Quote:
so you are being asked:

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 :oops:
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Re: GMATprep DS Sqaure [#permalink] New post   11 Nov 2007, 12:02
[quote="GGUY"][quote]so you are being asked:

is |x-3| = 3-x ?

this will be true when x=3 or x x 3 can be anything (i.e 4 ---> out of range).

About solving absolute values questions ---> see attachment



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This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
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Re: GMATprep DS Sqaure [#permalink]
11 Nov 2007, 12:02
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