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If x < 0, then Sqrt (-X*|X|) is -x -1 1 x

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Director
Joined: 10 Oct 2005
Posts: 524

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Location: US
If x < 0, then Sqrt (-X*|X|) is -x -1 1 x  [#permalink]

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05 Oct 2006, 01:46
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If x < 0, then Sqrt (-X*|X|) is

-x
-1
1
x
Sqrt(x)

Kudos [?]: 70 [0], given: 0

Senior Manager
Joined: 30 Aug 2006
Posts: 373

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05 Oct 2006, 01:55
for square root we only want +ve principle root, so -x ?

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VP
Joined: 25 Jun 2006
Posts: 1161

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05 Oct 2006, 02:00
A.

-x is positive.
|x| is also -x.

so u get -x out of the radical.

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Director
Joined: 06 Sep 2006
Posts: 734

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05 Oct 2006, 11:19
|x| = x if x > 0
|x| = -x if x < 0

so sqrt(-x * -x)
= x

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Senior Manager
Joined: 16 Sep 2006
Posts: 405

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06 Oct 2006, 11:00
tennis_ball wrote:
A.

-x is positive.
|x| is also -x.

so u get -x out of the radical.

sounds gud........since the answer is neway a positive number .........the result has to be -x..............but m still baffled

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06 Oct 2006, 11:00
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