You are not supposed to take the solution and present is as your own. We are not here to do your homework for you, but rather to help you do your HW. I have also clearly stated at the beginning of the solution that I sometimes provide solutions from the book's solutions manual and although this time the solution is purely mine, other students might have purchased it before and there is a chance that others would purchase it in the future so you always need to reword the answers
you are right...
Thank you but I am not sure what you mean by your message