Question

0.18 Let M be a 3 x 3 non-zero, skew-symmetric real matrix. If I is the 3 x 3 identity matrix, then
(A) M is invertible
(B) the matrix I + M is invertible
(C) there exists a non-zero real number a such that al + M is not invertible
(D) all the eigenvalues of M are real​

Answer 1

Answer:

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