1.
Let A=(α16β)A = \begin{pmatrix} \alpha & -1 \\ 6 & \beta \end{pmatrix}, α>0\alpha > 0, such that det(A)=0\det(A) = 0 and α+β=1\alpha + \beta = 1. If II denotes the 2×22 \times 2 identity matrix, then the matrix (I+A)8(I + A)^{8} is: