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Question 117-OG12-Why am I not getting it?

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Question 117-OG12-Why am I not getting it? [#permalink] New post 23 Nov 2011, 12:15
I took the GMAT a couple of years back and scored a 690. I put off going to school due to family issues. I am reapplying this year and have some time..so I figured I would retake the test to see if I can get a higher score.

I feel very stupid as I remember doing these type of questions in the past, but I am drawing a blank on this particular question.
I have even looked at the answer and am still getting slightly confused when it comes to the end.

I know how they get to:

√(n+1)+√n /√(n+1)^2 -√n^2

I am just confused when simplifying the expression further-the next line down where they have

√(n+1)+(√n) /(n+1)-n

How did they get the (√(n+1)^2-√(n)^2 out of the denominator?
Any assistance is appreciated.

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Last edited by pittguy578 on 23 Nov 2011, 12:37, edited 1 time in total.
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Re: Question 117-OG12-Why am I not getting it? [#permalink] New post 23 Nov 2011, 12:21
Can you please post the whole question?

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Re: Question 117-OG12-Why am I not getting it? [#permalink] New post 23 Nov 2011, 12:38
I attached a photo of the question to the original message..too much typing otherwise:)
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Re: Question 117-OG12-Why am I not getting it? [#permalink] New post 23 Nov 2011, 13:21
pittguy578:

Multiply √(n+1)^2+√(n)^2 by the numerator and by the denominator, simplify and you will get to answer E.
Re: Question 117-OG12-Why am I not getting it?   [#permalink] 23 Nov 2011, 13:21
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