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I remember reading in one of the posts that Whenever we take

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Manager
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Joined: 31 Dec 2003
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I remember reading in one of the posts that Whenever we take [#permalink] New post 01 Sep 2004, 05:26
I remember reading in one of the posts that
Whenever we take the sqrt ,we consider only the +ve values.
Eg. sqrt (9) = +3 only.

And whenever we have x^2=9 , this implies that x = +/- 3.

ian777 also gave an OG question that deals with this.

My question is -

I remember reading that the square root of a square of a negative number is the negative number itself.
Eg. sqrt ( (-3)^2 ) = -3, if its explicitly mentioned within the srqt that we have a (-3)^2. ----- a
and sqrt ( (-3)^2 ) = 3 (this is fine).

Does this rule 'a' apply to GMAT.

Thanks.
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 [#permalink] New post 01 Sep 2004, 05:42
Anuramm,

A^2 >0 whatever A>0 or <0

GMAT rule is : You can use the sqrt(V) only with positive numbers VA= A^(1/2) and we do not know what is (-1)^(1/2)

To be more accurate but it is not a GMAT rule, you can apply sqrt on <0 numbers, resulting in a complex number through a special value : i^2=-1
so that VA =iV(-A) if A <0
  [#permalink] 01 Sep 2004, 05:42
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I remember reading in one of the posts that Whenever we take

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