Wasn't sure where to put this exactly. It's in a question to do with diagonalising matrices (using the matrix of eigenvectors and what not), and I have the solution in front of me, but I'm stuck on how they get from one step to another. I understand the solution up to here...

...which I simplified to...

...or...

Now, the answer is apparently , but no matter how I manipulate that above, I can't get this answer.

Any ideas where I'm going wrong / what I'm missing?