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What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m

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vivek123
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What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 11:38
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What is the value of integer 'm'

(1) m(m+2) = 15
(2) (m+2)^m = 125



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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 12:20
vivek123 wrote:
What is the value of integer 'm'

(1) m(m+2) = 15
( 2) (m+2)^m = 125



THIS is a try

st 1 gives a quadratic : m^2+2M-15=O
computing discrimant D delta =64
Hence two values not sufficient to give A VALUE

ST2 (m+2)^m= 125
So i try to write 125 with powers
so 5^3
So m be 3
and Sum 3+2 power 3 GIVES 125
so m is 3

So b
hope this is not ets trap

plz correct me if i am wrong
thanks
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 12:49
We had the same question a couple of days ago.
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 19:08
mandy wrote:
st 1 gives a quadratic : m^2+2M-15=O
computing discrimant D delta =64
Hence two values not sufficient to give A VALUESo B


B is correct one.
but what is "computing discrimant D delta =64"?
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 20:25
In general quadratic expression ax^2+bx+c=0, discriminant = b^2-4ac
in this case 64, which means that there are two distinct solutions.

See also:
https://www.gmatclub.com/phpbb/viewtopic.php?t=18746
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 21:53
This is an ETS question.

I put this since OA given is 'C', though I answered it as 'B'.

Can anybody tell, why is it 'C' & not 'B'?
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink] New post   09 Aug 2005, 22:06
vivek123 wrote:
This is an ETS question. I put this since OA given is 'C', though I answered it as 'B'. Can anybody tell, why is it 'C' & not 'B'?


i do not think it is C. it should be B because if we use trial and error in statement ii, it gives 3 as value of m.



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Thank you for understanding, and happy exploring!
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Re: What is the value of integer 'm' (1) m(m+2) = 15 (2) (m+2)^m [#permalink]
09 Aug 2005, 22:06
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