Posted by Anna on Friday, May 25, 2012 at 12:44pm.
Find the limit as x approaches zero from the right of ((sqrt((1+x)/(x^2))(1/x))
I don't even know where to start with this. Help?
P.S. If you go to the wolfphram alpha website and put copy and paste ((sqrt((1+x)/(x^2))(1/x)) into the search bar you can see what it looks like.
Thanks!

Calc  Steve, Friday, May 25, 2012 at 1:20pm
as long as you're at wolframalpha, type in
limit x>0+ (sqrt((1+x)/(x^2))(1/x))
and see that the limit is 1/2. The question is, how do you figure it?
√((1+x)/x^2) = √(1+x)/x
so,
√((1+x)/(x^2))(1/x) = √(1+x)/x  1/x
= (√(1+x)  1)/x
As x>0, the fraction is 0/0, so use L'Hospital's Rule to get
1/(2√(1+x)) / 1 = 1/2

Calc  Anna, Friday, May 25, 2012 at 1:53pm
Oh, I forgot all about L'Hospital's Rule. Thanks!
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