The sum of the eigenvalues of the matrix
\( A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}^2 \)
is _____________ (rounded off to the nearest integer).
For the matrix \[ [A] = \begin{bmatrix} 1 & 2 & 3 \\ 3 & 2 & 1 \\ 3 & 1 & 2 \end{bmatrix} \] which of the following statements is/are TRUE?
If $M$ is an arbitrary real $n \times n$ matrix, then which of the following matrices will have non-negative eigenvalues?