I'm sorry, there was a little mistake - only the first row is relevant to my question - I don't understand it...
I need to prove that |adj(A)|=|A|^(n-1) for every non singular A in F^nxn, while n>2.
The solution says:
I can understand the first equality - |adj(A)|=||A|*A^(-1)|,
but I can't understand the rest.
Can you please help me?