Question

The sum of the Eigen values of the matrix A=[
1 −4 4
1 −2 4
2 −1 3
]
is

Answer 1

Answer:

The sum of Eigen values of a matrix is equal to the trace of the matrix. The trace of an n × n square matrix A is defined to be the sum of the elements on the main diagonal (the diagonal from the upper left to the lower right) of A.