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What's a quick and easy way to determine domain/range? watch

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    I know the principle of the two terms but I often get confused when I am asked to find the domain or range of complex looking equations like x+2/x which would be a nightmare to try and plot. What's an easy way to find the domain and range for functions that look confusing?
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    Domain is usually (though not always) all the real numbers minus any which will give non-real/infinite answers. In that example, for instance, the domain is all real numbers except 0. The range is trickier: you could try trying to find an inverse, and find domain of that. That's what I'd probably do for the example.
 
 
 
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