I knooow, one slip with your cubic shiz in eigenvalues and you're dead. By the way, do you just write down the determinant of
M−λI directly or do you write out the matrix
M−λI first?
I definitely agree re: the vector question. I had to re-do that question once or twice, the first time was without a diagram and I got muddled up with R, N, P, etc... but upon drawing the diagram, it all clicked and I ran through it smoothly.