3x3 matrix a. r1(3 -2 0) r2(0 1 1) r3(2 -1 0). don't calculate a^-1 or raise any matrix to a power first. calculate det(2a^-2)

Answer with explanation:

For, a 3 × 3, matrix

which are entries of First, Second and Third Row Respectively.

So, if written in the form of Matrix (A)

⇒Adjoint A= Transpose of Cofactor of A

⇒≡ |Adj.A|=1 ×(0-3) -2×(-2-0)

            = -3 +4

            =1     --------(1)

⇒For, a Matrix of Order, 3 × 3,

| Adj.A |=| A|²---------(2)

                                              --------------------------------------------(Using 1 and 2)

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