If A = diag (3 -2, 5) and B = diag (1 3 -4), find (A + B).
We are given two diagonal matrices A and B,
On adding the two diagonal matrices of order (3
) we get an diagonal matrix of order (3
3)
Each of the elements get added to the corresponding element hence, we get after adding, 
Hence, we get A+B = diag(4 1 1)
1