Question 78079
You describe what happens to the function at the far ends
of the x-axis.  That is to describe what happens to the 
function as x gets arbitrarily positively large and what
happens to the function when x get arbitrarily negatively
small.
Another way to say it is:
Find the limit of f(x) as x goes to + infinity.
Find the limit of f(x) as x goes to - infinity.
Hope this helps.
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Cheers,
Stan H.