PareshGmat wrote:

registerincog wrote:

If x is positive, then \(\frac{1}{\sqrt{x+1}+\sqrt{x}}=\)

A) 1

B) x

C) \(\frac{1}{x}\)

D) \(\sqrt{x+1}-\sqrt{x}\)

E) \(\sqrt{x+1}+\sqrt{x}\)

For such type of questions, change the middle sign & reciprocal

For example, \(\frac{1}{\sqrt{6} + \sqrt{5}} = \sqrt{6} - \sqrt{5}\)

Answer = D

I just encountered this question as part of my daily questions from the log and only got it right by guessing.

Could you elaborate how you get root 5&6?

Thanks and best regards,

Chris

_________________

A couple of things that helped me in verbal:

https://gmatclub.com/forum/verbal-strategies-268700.html#p2082192

Gmat Prep CAT #1: V42, Q34, 630

Gmat Prep CAT #2: V46, Q35, 660

Gmat Prep CAT #3: V41, Q42, 680

On the mission to improve my quant score, all help is appreciated!