I can't speak for others, but I find that impossible to follow. "find the matrix of the following"?? I also don't understand the parts that followed that. Are those vectors with subscripts? I don't see any equations to clue me in. (And without any equations, what on Earth does "I tried setting one side equal to the other" mean?)
You need to remember that readers have no idea the context of your question. We've no idea what class you're taking, what book you're using, what chapter you're in, etc..
If you could try to clarify the question, I'd be happy to try to help you with it.