Value of 3 root -89

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Baskaranselva: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Thu May 29, 2008 12:01 pm

by Baskaranselva » Mon Aug 18, 2008 10:42 am

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

Thanks
Baskaran[/img]

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Source: Beat The GMAT — Problem Solving | Mon Aug 18, 2008 10:42 am

pepeprepa: Legendary Member; Posts: 661; Joined: Tue Jul 08, 2008 12:58 pm; Location: France; Thanked: 48 times

by pepeprepa » Mon Aug 18, 2008 10:49 am

Man if it is 3*sqrt(-89) it does not exist

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sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pmFollowed by: 3 members; Location: INDIA; Thanked: 84 times

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

Thanks
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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Baskaranselva: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Thu May 29, 2008 12:01 pm

by Baskaranselva » Mon Aug 18, 2008 11:39 am

Yes, it is cube root of -89.

Answer is C

Thanks

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