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Could someone explain why

$$\lim\limits_{x\to-\infty}\log [1 + \exp(-x)]+x=0$$

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    Excuse me, I didn't understand your question.2012-09-22
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    i want to know how we got this result2012-09-22
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    Which result are you talking about?2012-09-22
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    Limit[Log [1 + E^(-x)] + x, x -> -Infinity] = 02012-09-22
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    The first version of the question was dreadful but, after the revision by @PeterTamaroff, this became a bona fide mathematical question. Hence I disagree with the decision to *close as not a real question*.2012-09-30
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    @did Well, yes, it was. I took me some time to understand what it was and edit accordingly. We can reopen.2012-09-30
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    How do I vote for reopen ? Or do I need more reputation for that ?2012-10-04

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