Limits by direct substitutionEvaluate limits of polynomial and rational functions at points where they are continuous by substituting the value.Limits by factoring (0/0 forms)Evaluate limits that give 0/0 on substitution by factoring and cancelling the common factor, or by rationalizing.Limits at infinityFind limits of rational functions as x grows without bound by comparing the degrees of the top and bottom.One-sided limits and continuityRead one-sided limits, two-sided limits and function values from a graph, and decide whether the function is continuous or has a jump or removable discontinuity.