Flexible variables: bend them to your will
Today’s video is one of the most useful I’ve made. In Flexible Variables: Bend Them to Your Will!, I work through five increasingly challenging TMUA past-paper questions where the quickest route is to give the letters some convenient values.
It’s a legitimate method rooted in logic: the correct general answer must work for every permitted choice of values, so any option that fails for your chosen values can be eliminated. I also look at when it works and how to choose useful values.