I was reading your 2014 free trial exam paper 1 for Specialist Maths and noticed an error to the solution of question 1. In part a, the question asks to simplify f(x) which results in a potential removal of a restriction to the original domain. Then in part b and c, it is important that the original domain which is R+ should be used instead of R\{0}. So the solution to part b should be [2, inf) and the graph in part c should have the right branch only.