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# What is the value of x? 1) x^x = 2x 2) = x^2

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Senior Manager
Joined: 30 Aug 2003
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What is the value of x? 1) x^x = 2x 2) = x^2 [#permalink]  05 Feb 2004, 17:54
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What is the value of x?

1) x^x = 2x
2) [x] = x^2
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shubhangi

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Joined: 15 Dec 2003
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Kudos [?]: 216 [0], given: 0

From 1) if 0^0 = 0 then possible answers can be 0 and 2
From 2) we get 0, -1, 1
Therefore C, if 0^0=0
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Paul

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Joined: 30 Oct 2003
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Location: NewJersey USA
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Kudos [?]: 41 [0], given: 0

0^0 is undefined.

I believe A is the answer.

X^X = 2 * X so X = 2
[X] = X^2 X = 0, -1, 1
GMAT Club Legend
Joined: 15 Dec 2003
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Kudos [?]: 216 [0], given: 0

oops, I meant otherwise A is the answer since only 2 can result from first stem. How silly
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Paul

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Kudos [?]: 2 [0], given: 0

Quote:
[X] = X^2 X = 0, -1, 1

[-1] = -1

Last edited by Zhung Gazi on 05 Feb 2004, 20:11, edited 3 times in total.
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4313
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Kudos [?]: 216 [0], given: 0

What are you trying to demonstrate here Zhung Gazi?

Quote:
[-1] = -1

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Best Regards,

Paul

Manager
Joined: 25 Jan 2004
Posts: 92
Location: China
Followers: 1

Kudos [?]: 2 [0], given: 0

Paul wrote:
What are you trying to demonstrate here Zhung Gazi?

Quote:
[-1] = -1

[X] = X^2
[-1] = -1 != (-1)^2
Manager
Joined: 28 Jan 2004
Posts: 203
Location: India
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Kudos [?]: 12 [0], given: 4

Zhung Gazi..u have an eagle's eye. You caught paul and Anand correcty.
SVP
Joined: 30 Oct 2003
Posts: 1797
Location: NewJersey USA
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Kudos [?]: 41 [0], given: 0

When did the absolute value of -1 = -1 ?
Absolute value is always +ve
Manager
Joined: 25 Jan 2004
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Location: China
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Kudos [?]: 2 [0], given: 0

[x] = integral part of x
{x} = x - [x] = fractional part of x
|x| = absolute value of x
GMAT Club Legend
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Kudos [?]: 216 [0], given: 0

Well, this got me totally confused. shubhangi, can you confirm what you meant by [x]? Ever since "[]" was used on this board, it always stood for abs. value. Besides, GMAT never really tested you on the "integral" or "fractional" part of any number
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Paul

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Joined: 16 Jan 2004
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Kudos [?]: 0 [0], given: 0

I beleive the answer should be A

1. x^2 = 2x which means x = 2 sufficient
2. x^2 = x X could be = or 1. Insufficient

How can we assume [x] to be an integral part of x. It is not explicitly stated in the question
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