AQA C3 June 2014 Question 5

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Welcome to one the most irritating topics on the C3 exam, I just don't like this topic as the maths is easy to understand but it is just a bit of theory to remember,

Anyway this question Is all about functions and their inverse
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For part B, the mark scheme says that 3 - sqrt(X+4) must be rejected. i dont get why its not accepted. can you please explain this?

samtrip