2.6 Limits at Infinity. |x|x As x approaches infinity f(x)  ? as x gets larger and larger f(x)  ? as x gets larger and larger in the negative direction.

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Presentation transcript:

2.6 Limits at Infinity

|x|x As x approaches infinity f(x)  ? as x gets larger and larger f(x)  ? as x gets larger and larger in the negative direction  8 f (x) x → ∞ Fun Fact: A student, who is an excellent pattern-observer, was asked to find the following limit. He quickly answered 7

|x|x Limit at infinity If f ( x ) approaches L as x approaches ∞ or - ∞, then the limit as x approaches a of f ( x ) is L.  L f (x) x → ∞ means that the value of f ( x ) can be made as close to L as we like by taking x sufficiently large.

Graphical Approach Vertical Asymptote: x = -2 Horizontal Asymptote: y = 0

Horizontal Asymptote The line y = L is called a horizontal asymptote of the curve f ( x ) if either or L f

Examples Find the limits.

Horizontal Asymptote  Since f(x ) = e x has a horizontal asymptote y = 0  Polynomial functions have no horizontal asymptotes.  Find all horizontal asymptotes of the function.

Finding limits at infinity If n is a positive number, then  To find limits at infinity, we multiply the expression by where n is the highest power in the denominator.  Then use the above property to simplify.

Examples Find the limits.