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Limits at Infinity:
Consider a function f defined for large positive ( or negative ) values of x, as x increases indefinitely in the positive ( or negative ) direction. If the value of f(x) approaches a number b as x increases (or decreases ) indefinitely , then the limit of f(x) as x increases (or decreases ) indefinitely is equal to b, denoted as :
limx®+¥ f(x) = b or limx®-¥ f(x) = b
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