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Squares and Roots

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Manager
Joined: 20 Nov 2004
Posts: 108

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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
Posts: 1057

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Location: USA

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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)}?
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

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Manager
Joined: 23 Jan 2006
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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???

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Manager
Joined: 20 Nov 2004
Posts: 108

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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.

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26 Apr 2006, 10:01
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Squares and Roots

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