You may find online videos useful to review material from class and see additional examples. I particularly like the videos of a math teacher who goes by the name of “PatrickJMT.” Β He has posted hundreds of short videos on his website patrickjmt.com, including many which cover topics we will cover in the course (all the videos are also available on YouTube–his YT channel is here.)
Here are three videos which present examples of factoring differences of squares:
Factoring the Difference of Two Squares β Ex 1
Factoring the Difference of Two Squares β Ex 2