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# Squares and Roots

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Manager
Joined: 20 Nov 2004
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26 Apr 2006, 08:27
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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VP
Joined: 21 Sep 2003
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26 Apr 2006, 09:03
ccax guruji,

How do I interpret the Q?

Is it {(SQRT(x))^2 + SQRT(x^2)}?
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Manager
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26 Apr 2006, 09:50
Strange question i think.
First of all, the square root of a negative number can't be a real number right, and isn't one of the assumptions on GMAT that all numbers are real?
Second, isn't III implicit of both I&II???
Manager
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26 Apr 2006, 10:01
kook44 wrote:
First of all, the square root of a negative number can't be a real number right, and isn't one of the assumptions on GMAT that all numbers are real?

That's true. But you don't have to compute the square root of a
negative number to realize that it's always true that

sqrt(x)^2 = x

In contrary to

sqrt(x^2) = |x|

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kook44 wrote:
Second, isn't III implicit of both I&II???

Well it is, but to realize that has been a part of the question.
26 Apr 2006, 10:01
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