Evaluate the general limit of a rational function by direct substitution

The video tutorial discusses how to evaluate the limit of a rational function with a discontinuity. It explains the process of recognizing discontinuities, simplifying the function, and using direct substitution to find the limit. The tutorial emphasizes that direct substitution can be a quicker method when the limit is not at the point of discontinuity. The video concludes by suggesting the use of a graphing calculator for verification.

How can direct substitution be used to find the limit of a function?

Discuss the importance of checking your work with a graphing calculator when evaluating limits.