The matrix is

B=

3 -1

1 5

and I hate to show that it's not diagonalizable . I'm not really sure where to begin. I think the determinant (which I know equals 16) has something to do with it but I'm not sue where to go from there. I also need to reverse the rows of B and find both the eigenvalues and eigenvectors for this new matrix, as well as the e-vals and e-vectors for B traspose.