Can somebody please explain to me how the limit of this funciton is -1?(adsbygoogle = window.adsbygoogle || []).push({});

http://www.wolframalpha.com/input/?i=lim+%28sqrt%28x^2+%2B+2x+-1%29+%2B+x%29+as+x+approaches+-infinity

I've tried multiplying by the conjugate but that isn't helping since I keep getting negative infinity as the limit if I do that.

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# Simple Limit Question

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