Let A=(01−10)A = \begin{pmatrix} 0 & 1 \\ -1 & 0 \end{pmatrix}A=(0−110). If we define B=A4+A2+IB = A^4 + A^2 + IB=A4+A2+I, what are the eigenvalues of BBB?
λ=1\lambda = 1λ=1
λ=0\lambda = 0λ=0
λ=2\lambda = 2λ=2
λ=−1\lambda = -1λ=−1