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April 19, 2015

April 19, 2015

Posted by **MW** on Wednesday, March 18, 2009 at 8:32pm.

[1/x *((1/(sqrt(1+x))-1)]

It will be easier to understand if you write it out..

How would I algebraically do this? (The answer is -1/2)

Help please?

- Pre Calc -
**drwls**, Wednesday, March 18, 2009 at 10:50pmI suggest you use L'Hopital's rule. The limit of the ratio of (1/(sqrt(1+x))-1)] to x is the ratio of the derivatives of numerator and denominator.

The derivative of x (the denominator) is 1.

The derivative of 1/(sqrt(1+x) -1 at x = 0 is (-1/2)(1+x)^-3/2 = -1/2

So the limit is (-1/2)/1 = -1/2

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