1 minute 55 in and I am able to follow you solve the problem but I have no idea why you're doing it that way or what factorisation means.
The feedback I'm giving is you should explain the concepts a little bit more instead of just solving them. Think of your students as someone who doesn't actually know much at all. I know how to add, subtract and multiply, I know x and y can be replaced by numbers, but I have no idea what you meant by factorise and the next steps you did.