Limit of sqrt(x^2 + x) - x as x Approaches Infinity

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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?
 
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1=\frac{\sqrt{x^{2}+x}+x}{\sqrt{x^{2}+x}+x}
 
Yeah like arildno suggested you need to rationalize the expression by multiplying with what post #2 suggests!
 
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