Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/let-f-g-r-to-r-defined-by-f-x-x-1-g-x-2x-3-fin/relations-and-functions/9967105
Regards
https://www.meritnation.com/ask-answer/question/let-f-g-r-to-r-defined-by-f-x-x-1-g-x-2x-3-fin/relations-and-functions/9967105
Regards