Inequalities with Desmos Graphing Calculator

I used CaptureSpace to record an instructional video on how to graph inequalities with Desmos graphing calculator.  I thought using CaptureSpace was a fairly straightforward process, which isn’t how I normally feel after using a program for the first time.  I was easily able to record my video and upload it to the UP media page.  In the future, I could see myself using a screencast to explain to students how to use technology, such as the Desmos graphing calculator or even certain functions on a Texas Instruments calculator.  I could also use it show mathematical proofs for things that I don’t have time to prove in class.  For example, if I want my students to know that the derivative of sin(u) is cos(u), but I don’t have time to show a formal proof in class, I could give them access to a screencast of me proving it.

One thing I don’t like about screencasting is how difficult it can be to fix mistakes.  For example, when I re-watched the embedded video, I realized that I made a mistake at the 1:33 mark – I said the circle had radius 4 when I meant to say that it had radius 2.  This was a small mistake, so I just let it slide for the purposes of this assignment.  However, if I was sharing a video with my students, I would not want them to be confused by a mistake on my part.  Therefore, I would probably have to go back and re-shoot the entire video just to fix one mistake.  And then if I noticed I made a mistake in the re-shoot, I might have to record yet again!

Featured Image: Sykez Tom

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