Math IA is killing me,

So what I am doing is finding a function to model sth and I used two methods. The problem is the two methods I found them somewhere, one in a youtube video and one in a book. I kinda solved it on my own but of course, I used these two to help when I got stuck. I am citing the book but I am worried that even if I cite them the examiner would be like ok what is your work? I did add an application of the equation in the end and calculations that are my own and also of course there is the "Presenting the problem" part and reflections that are my own, but finding the function takes the most space of my IA. I am not citing the video but citing a textbook that kind of has the out of the syllabus part only which is what I needed help with, Anyways, will I be punished for plagiarism? In the feedback for the first draft, my teacher said nothing and when I asked him about it he said it is fine but again, I am scared (Am I being paranoid? maybe, I don't want to lose my diploma because of a fucking IA).