Use these facts:
- where is a constant, is the size of the matrix
- ..... Can be shown here
______________
You should know that:
Multiply both sides by to get:
If A is 3x3 and detA=2, then det(A^-1-(adjA)) = ?
I know that the answer is -(1/2)
and my teacher did it on the board, saying that adjA=(detA)(A^-1)
but I don't understand that part of it!
i'd really appreciate it if someone would explain it to me
thanks in advance