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absolutes

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absolutes [#permalink] New post 10 Aug 2010, 22:20
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

4% (01:18) correct 95% (00:25) wrong based on 21 sessions
Which of the following always equals sqrt(9+x^2-6x)?
a)x-3
b)3+x
c)|3+x|
d)|3-x|
e)3-x
[Reveal] Spoiler: OA
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Re: absolutes [#permalink] New post 10 Aug 2010, 22:48
bibha wrote:
Which of the following always equals sqrt(9+x^2-6x)?
a)x-3
b)3+x
c)|3+x|
d)|3-x|
e)3-x


I got D as the answer
\sqrt{9+x^2-6x}= \sqrt{(x-3)^2}= |3-x| or |x-3|
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Re: absolutes [#permalink] New post 11 Aug 2010, 01:28
It's |x-3| or |3-x|
(D)
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Re: absolutes [#permalink] New post 11 Aug 2010, 13:11
It should be D
sqrt(x^2)=|x|

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Re: absolutes   [#permalink] 11 Aug 2010, 13:11
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