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Value of 3 root -89

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by pepeprepa » Mon Aug 18, 2008 10:49 am
Man if it is 3*sqrt(-89) it does not exist
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Re: Value of 3 root -89

by sudhir3127 » Mon Aug 18, 2008 11:36 am
Baskaranselva wrote:The value of 3 root -89 is

1. Between -9 and -10
2. Between -8 and -9
3. Between -4 and -5
4. Between -3 and -4
5. Undefined

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Baskaran[/img]
i guess its cube root (-89)

if thats the case then IMO its 3.

( -4)^3 = -64
(-5)^3 = -125

and -89 lies in this interval ... hence its C

Though i know cube roots of negatives exists just i was sure the square roots of negatives exists in advanced maths.. I am not sure if they exists on GMAT.

I request Ian/Stuart to give some insights on this one,..
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by Baskaranselva » Mon Aug 18, 2008 11:39 am
Yes, it is cube root of -89.

Answer is C

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