The closure/on hold banner, which was posted under your question when it was put on hold (and politely linked to in a comment beforehand), contains a link to this site's guidelines for homework and exercise-based questions; you're expected to read them carefully and act accordingly. If you're not willing to spend the effort to understand the community's standards and adjust your posts to them, this site may not be for you.
In its current form, your post is an open-and-shut case of a homework-and-exercises question, which this community (for good reasons) holds to specific standards that you need to comply with. As is made clear in the guidelines, it is entirely irrelevant whether this was set to you as homework during some course or not: what matters in this case is that your post is exclusively about a set-piece, that you're not asking at any conceptual depth, and that the question is of extremely limited usefulness to any future visitor.
To be clear, the difficulty of the question, including whether any or all of your instructors have trouble solving the set-piece, are entirely irrelevant to whether the post is on topic on this site.
There are a bunch of problems with your post. To start with:
- You provide the set-piece as a scan instead of spending any effort in transcribing the text.
You provide your working as a scan of your notes, instead of properly writing the equations using mathematical LaTeX notation and supplying the connective tissue of argumentation that links your equations together.
(This might not yet have been fully impressed on you by your instructors, in which case I would say they're rather at fault. A string of equations with no connecting text is never something you should present to other people.)
It's not particularly clear what you're asking, beyond "please solve this set-piece for me". If that's what you want from this question, without any willingness on your part to ask about the concepts and methods that underpin the task, then your question is unlikely to be on-topic here at all.
You should fix all of the above for the question to begin to be eligible for reopening. Some of these are formatting issues and they are still crucial: they are there make your question parseable by answerers and future visitors without the rather large effort that your question requires in its current form. (Or, to put it another way, if you're not willing to put in any effort into correctly presenting your question in a readable form, why should anyone spend any effort answering it?) Other issues are conceptual: they're mostly to do with the fact that you're not asking about any concepts or methods and in the current form you just want people to do your work for you.
