I need to finding A. f o g , B. g o f , and the domain of each function and of each composite function.

I need to finding A. f o g , B. g o f , and the domain of each function and of each composite function.

Also need help with Finding Domains of Functions and Composite Functions . I need to finding A. f o g , B. g o f , and the domain of each function and of each composite function.
The one I’m having problems with is number 40 the one that is circled