I'm currently doing a PhD in Computer Science (machine learning), and I sometimes feel I need a bit of a guidance when it comes to linear algebra questions. Hope to get some help here!
2. parentheses would help someone interpret what this expression so that it may be simplified.
3. post algebra problems in the algebra forum ... not in the lobby, and do not piggy-back on someone else's thread.
4. finally, do not make multiple posts of the same problem.