Can L'Hopital's Rule Be Used for Limits to Infinity?

[Lucy Yeats]

I understand the use of this rule for the limit as x goes to 0, but not for the limit as x goes to infinity. Can this rule be used to find limits to infinity? How?

I have googled this but couldn't find a good explanation.

 

[AlephZero]

You can substitute u =1/x, and find the limit as u goes to 0.

 

[Lucy Yeats]

Thanks!