Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/let-f-x-x-and-g-x-2x-1-be-two-real-function-find-f-g-x/relations-and-functions/8186065
Regards
https://www.meritnation.com/ask-answer/question/let-f-x-x-and-g-x-2x-1-be-two-real-function-find-f-g-x/relations-and-functions/8186065
Regards