1. The problem statement, all variables and given/known data The matrix 1 2 -3 2 5 -4 -3 -4 6 is a symmetric matrix by my reckoning. Although in this MCQ that is not an option. The options are a)Hermitian b)antisymmetric c)orthogonal d)idempotent 3. The attempt at a solution Hermitian should have complex entities, we have none, so it is not Hermitian antisymmetric should be -A=AT and this does not obey that rule, so ruled out. orthogonal should have AT=A-1 again not in this case idempotent should be A*A=A, again this does not obey So what should be the answer?