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# value of cube root of -89

Author Message
Intern
Joined: 04 Dec 2009
Posts: 23
Followers: 0

Kudos [?]: 11 [0], given: 13

value of cube root of -89 [#permalink]  11 Jun 2010, 07:06
The value of cube root of -89 is

1) between -9 and -10
2) between -8 and -9
3) between -4 and -5
4) between -3 and -4
5) undefined

I went for A but that was wrong.Can anyone help please
Director
Joined: 24 Aug 2007
Posts: 954
WE 1: 3.5 yrs IT
WE 2: 2.5 yrs Retail chain
Followers: 59

Kudos [?]: 835 [0], given: 40

Re: value of cube root of -89 [#permalink]  11 Jun 2010, 07:08
IMO 3) between -4 and -5

$$-4*-4*-4$$ = -64
$$-5*-5*-5$$ = -125
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CEO
Joined: 15 Aug 2003
Posts: 3467
Followers: 61

Kudos [?]: 708 [0], given: 781

Re: value of cube root of -89 [#permalink]  11 Jun 2010, 13:20
gautamsubrahmanyam wrote:
The value of cube root of -89 is

1) between -9 and -10
2) between -8 and -9
3) between -4 and -5
4) between -3 and -4
5) undefined

I went for A but that was wrong.Can anyone help please

Lets go the other way around and work with cubes. The cube of -9 is -729 and the cube of -10 is -1000. Hence, A cannot be the answer.

The cube of -4 is 64 and the cube of 5 is 125. Hence (4) is the correct choice.
Re: value of cube root of -89   [#permalink] 11 Jun 2010, 13:20
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# value of cube root of -89

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