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If x < 0, what is sqrt(-x|x|) ? 1) -x 2)-1 3) 1 4) x 5)

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SVP
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If x < 0, what is sqrt(-x|x|) ? 1) -x 2)-1 3) 1 4) x 5) [#permalink] New post 11 Sep 2006, 09:16
If x < 0, what is sqrt(-x|x|) ?

1) -x
2)-1
3) 1
4) x
5) sqrt(x)
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 [#permalink] New post 11 Sep 2006, 12:24
(A) or (1).

As x<0, Sqrt(-x*|x|) makes sens and is equal to -x (that is positive)
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 [#permalink] New post 11 Sep 2006, 12:36
A. -x

By definition sqrt(x^2) = -x when x < 0.

Look at :
http://en.wikipedia.org/wiki/Square_root#Properties
  [#permalink] 11 Sep 2006, 12:36
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If x < 0, what is sqrt(-x|x|) ? 1) -x 2)-1 3) 1 4) x 5)

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