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

Author Message
SVP
Joined: 05 Jul 2006
Posts: 1741

Kudos [?]: 418 [0], given: 49

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

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11 Sep 2006, 10:16
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x < 0, what is sqrt(-x|x|) ?

1) -x
2)-1
3) 1
4) x
5) sqrt(x)

Kudos [?]: 418 [0], given: 49

SVP
Joined: 01 May 2006
Posts: 1794

Kudos [?]: 165 [0], given: 0

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11 Sep 2006, 13:24
(A) or (1).

As x<0, Sqrt(-x*|x|) makes sens and is equal to -x (that is positive)

Kudos [?]: 165 [0], given: 0

VP
Joined: 02 Jun 2006
Posts: 1258

Kudos [?]: 101 [0], given: 0

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11 Sep 2006, 13:36
A. -x

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

Look at :
http://en.wikipedia.org/wiki/Square_root#Properties

Kudos [?]: 101 [0], given: 0

11 Sep 2006, 13:36
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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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