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

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Director
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If x < 0, then Sqrt (-X*|X|) is -x -1 1 x  [#permalink] New post 05 Oct 2006, 00:46
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If x < 0, then Sqrt (-X*|X|) is


-x
-1
1
x
Sqrt(x)

Please justify your answer
Senior Manager
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 [#permalink] New post 05 Oct 2006, 00:55
for square root we only want +ve principle root, so -x ?
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 [#permalink] New post 05 Oct 2006, 01:00
A.

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

so u get -x out of the radical.
Director
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 [#permalink] New post 05 Oct 2006, 10:19
|x| = x if x > 0
|x| = -x if x < 0

so sqrt(-x * -x)
= x
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 [#permalink] New post 06 Oct 2006, 10:00
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
  [#permalink] 06 Oct 2006, 10:00
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If x < 0, then Sqrt (-X*|X|) is -x -1 1 x

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