Evaluating the limit of a function as it approaches infinity is really finding what the end behavior of that function is. To address end behavior, you will want to use something you already know, horizontal asymptotes. As an




Example:

To find the limit of the function, you need to look at the terms that will always be the largest on both the numerator and the denominator. If you were to plug in a very large number for














Function with higher power in the denominator:

The limit is




Function with higher power in the numerator:

The limit as



Important to remember:

This is true for all functions that are not piecewise defined functions or inverse tangent functions, because both of those kinds of functions have different end behaviors.
Graphical representation of the limits (in order):






Other helpful sources:
https://www.math.ucdavis.edu/~kouba/CalcOneDIRECTORY/liminfdirectory/LimitInfinity.html
https://www.mathsisfun.com/calculus/limits-infinity.html
https://www.khanacademy.org/math/differential-calculus/limits-topic/limits-infinity/v/more-limits-at-infinity
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