I could also look for university course pages. For instance, Stanford or Harvard might have courses in quantum mechanics, but again, the textbook used might vary. If I can find a course that specifically uses Liboff's 4th edition, maybe the professor has posted some solutions. This is a bit difficult without knowing specific universities.
If all else fails, maybe joining academic groups on Facebook or LinkedIn could help. Sometimes people in those groups share resources. Alternatively, academic help sites like Course Hero might have the solutions, but again, those require a subscription. I could also look for university course pages
Then there's the problem of finding PDFs on torrents or pirate sites. Though I'm not comfortable with that since it's illegal. Maybe there's an official solutions manual sold separately. Let me check Amazon or other booksellers. If there's a solutions manual available, then purchasing it would be legitimate. Searching for "Liboff 4th edition solutions manual" on Amazon... Hmm, not seeing any results for the 4th edition specifically, maybe the older editions. This is a bit difficult without knowing specific
So, after considering all these, I need to decide which path to take based on legality, availability, and personal ethics. Alternatively, academic help sites like Course Hero might