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If n is positive, which of the following is equal to

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Intern
Joined: 17 Jul 2006
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If n is positive, which of the following is equal to [#permalink]

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31 Aug 2006, 15:11
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If n is positive, which of the following is equal to 1/((n+1)^1/2 - n^1/2)?

a. 1
b. (2n+1)^1/2
c. (n+1)^1/2 / (n^1/2)
d. (n+1)^1/2 - (n)^1/2
e. (n+1)^1/2 + (n)^1/2

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Intern
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31 Aug 2006, 15:54
how did u get that answer?

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Intern
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31 Aug 2006, 16:10
how did u get that answer?

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Manager
Joined: 26 Aug 2006
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31 Aug 2006, 18:04
cejismundo,

just multiply and divide the equation by (n+1)^1/2 + (n)^1/2

Using concept a^2 - b^2 = (a-b)(a+b), the denominator will become 1

So all you will have left is (n+1)^1/2 + (n)^1/2

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Current Student
Joined: 29 Jan 2005
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31 Aug 2006, 20:01
rookie06 wrote:
cejismundo,

just multiply and divide the equation by (n+1)^1/2 + (n)^1/2

Using concept a^2 - b^2 = (a-b)(a+b), the denominator will become 1

So all you will have left is (n+1)^1/2 + (n)^1/2

In that case, wouldn't (D) be the correct answer.

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31 Aug 2006, 20:01
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