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What is the value of the integer n 1. n(n+2)=15 2.

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What is the value of the integer n 1. n(n+2)=15 2. [#permalink] New post 14 Jun 2006, 19:11
What is the value of the integer n

1. n(n+2)=15
2. (n+2)^n=125

THe answer key says C these answers are sometimes wrong, so i dunno, anyone know why its C i mean im wondering if its B i know its not A because -7 and -3 would work, but im wondering if its B. Anyone know? Nevermind i get it its C bcause u get 2 soultiuons on A and only the soulation of one works on teh 2nd one hence C, what a dummie question i put on here, sorry guys.
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 [#permalink] New post 14 Jun 2006, 20:09
St1:

n^2+2n-15 = 0
(n-3)(n+5) = 0
n = 3, n = -5 ---> Insufficient.

St2:
(n+2)^n = 125
n must be 3, since (3+2)^3 = 125....

I can't see why it's C. Should be B.
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 [#permalink] New post 14 Jun 2006, 22:32
1) n(n+2) = 15
Hence n can be -5 or 3

Not suff

2) (n+2)^n = 125
(n+2)^n = 5^3

Only 3 satisfies N hence B is suff.
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 [#permalink] New post 14 Jun 2006, 23:08
Should be B.

(n +2)^n = 125 has only one answer, I reckon, and that is 3. The first expression can evaluate to -5 or 3.
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 [#permalink] New post 15 Jun 2006, 06:14
official answer is B i checked.
  [#permalink] 15 Jun 2006, 06:14
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What is the value of the integer n 1. n(n+2)=15 2.

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