# Computing Limits at Infinity

The limits in sections 10.1 and 10.2 were limits in which the value of x approached some finite value. By writing

we were looking for the behavior of the function (x) as x got closer and closer to the value a. In this section we’ll learn how to evaluate a second type of limit. In limits at infinity, we look at the behavior of the function as x gets more and more positive or as x gets more and more negative. We symbolize limits like this by writing

or

As with other limits, we may evaluate the limit with a table, graph, or using algebra.