Hello, I have questions for IB Higher Level Math: Analysis and Approaches - functions

Hello, I have questions for IB Higher Level Math: Analysis and Approaches - functions


Functions - Arusha Sahai For (1h): the answer markscheme says that f(g(x)) does not exist, but why? I thought the answer for part (a) would be Rf ⊆ Dg…why is that wrong? I don’t understand how to solve the questions involving a AND x..can you please explain?