If A = , show that adj A = 3A’.
We have,
To show: adj A = 3A’
Firstly, we find the Transpose of A i.e. A’
So,
…(i)
Now, we have to find adj A, and for that, we have to find co-factors:
Now, taking Adj A i.e.
= 3A’ [from eq. (i)]
Hence Proved