Thursday
June 20, 2013

# Homework Help: PreCalculus

Posted by Kay on Wednesday, December 9, 2009 at 7:30am.

i am confused about what approach to take for (limit as x goes to 0) of (ln(1+x))/x

if i had x going to infinity, i could do l'hospitals, but here?

• PreCalculus - drwls, Wednesday, December 9, 2009 at 8:23am

1n(1+x) has Taylor series expansion
x - x^2/2 + x^3/3 + ...

Divide that by x and you get
1 - x/2 + x/3 + ...

The limit as x-> 0 is 1

You could also use L'Hopital's rule for x-> 0. The same rule applies at any singularity (0/0 or infinity/infinity).

• PreCalculus - Kay, Wednesday, December 9, 2009 at 10:20am

I forgot about that expansion method. Will have to look it up. Thanks!

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