A short post, this. Just a link to a useful NCETM article on functions. I haven’t taught this yet, but I remember getting pretty upset by the notation f(x), fg(x), etc. when I learned it at school. One way of dealing with this might be to say that they have already encountered this function notation when doing trigonometry, after all sin(x) means sin of x, not sin times x. But then don’t we also say “of means times“. Arghh!

Anyway, it’s a great article and includes some ideas about linking this to: