# Another limit problem

1. Feb 25, 2008

### grothem

lim sqrt(x^2 + x) - x as x approaches infinity

Not sure what I need to do. I tried to make it into a fraction so I could apply L'Hospital's rule but I didnt' get anywhere with that. Any ideas?

2. Feb 25, 2008

### arildno

$$1=\frac{\sqrt{x^{2}+x}+x}{\sqrt{x^{2}+x}+x}$$

3. Feb 25, 2008

### sutupidmath

Yeah like arildno suggested you need to rationalize the expression by multiplying with what post #2 suggests!