Can someone explain please? C3Watch
It means f of f of x
Put 1 in and find f(1)
Then you use that answer to fin f[f(1)]
NB you need to take care as you used F(x) originally - for functions use lower case throughout
Sort of - notation like is mentioned in the spec.
For the type of question in the OP, see the original C3 June 2013 paper, where one part asks candidates to "determine the exact value of ff(0)".
If the students "understands" what composite functions are then they can apply the understanding to this question
When all they do is practice a set of questions - they may not have seen this example
I haven't checked the Edexcel spec, but surely if it was in an Edexcel exam it implies that it is included in the specification and candidates are expected to understand it?