Education Technology

## Transformation Graphing — the Families of Functions Modular Video Series to the Rescue!

Posted 10/29/2021 by Tom Reardon

Are your students struggling with graphing the parent functions or how to graph transformations of them? Texas Instruments is here to help teachers — and students — with a video resource that contains over 250 short colorful animated videos with over 460 examples that illustrate and explain these essential graphs and their transformations. This easy-to-use resource can be utilized in several ways:

• As a teaching and learning tool inside and outside the classroom
• As independent study and review
• To augment a flipped classroom

It is modular — you only use what you want or need! And students can work at their own pace.

Explore linear relations and slope
For introducing graphs of linear relationships, here is a screenshot from the video “How to Graph y = mx +b” that has students discover the relationship between the slope, y-intercept and the equation of a line and how to graph the line.

Students should recognize that the y-intercept is always the constant being added (or subtracted) to the term that contains x when solved for y. Also, notice how color is used as a teaching tool to assist students in recognizing patterns, spanning pre-algebra through calculus.

Share this video series with your students to help them learn and discover slope with six short videos on topics as seen in this screenshot from the website.

Check out the first video in this series, “What Slope Means, and Four ‘Flavors’ of Slope.”

Review 15 parent functions and their transformations
There are also modules for 14 common parent functions as well as a module focused on applying transformations to a generic piecewise function included in this video resource. Here is a list of the parent functions that are explained in great detail and also as a quick review.

In each function module, you will see the various transformations and combinations of the following transformations illustrated and explained in depth.

For each parent function, the videos give specific examples of graphing the transformed function using every type of transformation, and several combinations of these transformations are also included. Below is an animated GIF of screenshots from the video “Quick! Graph f(x+4)” for a generic piecewise function. Students are encouraged to plot transformations by discovering the patterns and making correct generalizations. Again, notice the use of color to assist this discovery.

One of the most difficult concepts for students to understand is how to graph functions affected by horizontal stretches and shrinks. Here is an animated GIF from the video “Exploring Function Transformations: ” that illustrates how the parameter for the coefficient of x affects the shape of the graph.

In every video, intentional use of proper mathematical terminology is present. For example, the screenshot below shows the terminology for analyzing a sinusoidal function after a combination of transformations has been applied: period, phase shift, point of inflection, maximum, minimum. This is encouraged throughout the video series.