Show that the matrix $$\begin{pmatrix}2 & 1& 1\\0 &3 & 1\\0 & 2&-1\end{pmatrix}$$ cannot be the adjoint of any invertible matrix with real entries.
im really stuck with this , is there any way?
2026-04-04 12:47:07.1775306827
show that the matrix can not be the adjoint of any invertible matrix with real entries
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