Instructional Video
Khan Academy

Khan Academy: Function Introduction: Recognizing Functions (Example 4)

9th - 10th
Explore recognizing functions in this video.
Instructional Video
Imagine Learning Classroom

Learn Zillion: Video: Understand Limitations of Using Zeros to Graph a Quadratic

9th - 10th Standards
In this lesson, you will learn the limitations of using zeros to graph a quadratic function by using functions with no zeros or real roots. [3:08]