$ \begin{pmatrix} -2 & 0 & 1 \\ -6 & -2 & 0 \\ 19 & 5 & -4 \\ \end{pmatrix} $
The main I have is if I'm doing my algebra right because the back of my book has λ = -8 (Sorry I misread back of the book) I still don't know how they got one answer.
I end up getting:
(-2 - λ)[(-2 - λ)(-4 - λ)] + 1[- 30 -( 19 (-2 - λ))] = 0
after simplifying:
λ^3 + 8λ^2 + λ - 8 = 0
Factoring:
(λ + 1)(λ - 1)(λ + 8)
What am I doing wrong? I see what I did wrong I forgot the negative when I added -16 to 8.