The image with this post is from a MathExpression.com video explaining how to deal with brackets in an equation. Frankly, not having had a course involving algebra since 1957 (yes, that’s 51 years) I really loved the video’s explanation, and will be coming back for more explanations. Recently I have been watching physics DVDs about string theory; though the lecturer refers to only a few equations for me to cope with, I am grateful for MathExpression.com. It is an ideal tool for me to check what I don’t understand in the equations.
The example of the video’s usefulness to me illustrates a key power of online learn nodes: the level of learning difficulty of the tutorial does not restrict the video’s availability to learners of any particular age, grade, or geographical location. I doubt many string theory students in their seventies have used the MathExpression.com tutorial on removing brackets in algebraic expression. Most visitors to MathExpression.com are probably high school and college students, with a few precocious grade schoolers and forgetful graduate students mixed in.
If I were teaching algebra, I would find MathExpression.com a fine source for its lessons, tips, and practice. The delightful voice on the videos is also worth the visit: she sounds like the voice of algebraic AI.
