DeterminantHard

Question

If A is a square matrix of order 3, then the true statement is (where I is unit matrix).

Options

A.det (- A) = - det A

B.det A = 0

C.det (A + I) = 1 + det A

D.det (2A) = 2 det A

Solution

det (-A) = (-1)ⁿ det (A) where n is order of square matrix.

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