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If \(A=\begin{bmatrix}1&-2&3\\0&-1&4\\-2&2&1\end{bmatrix}\), find (A T )–1.

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Best answer

= ( – 1 – 8) – 0 – 2( – 8 + 3) = – 9 + 10 = 1

Cofactors of B are:

C11 = – 9 C21 = 8 C31 = – 5

C12 = – 8 C22 = 7 C32 = – 4

C13 = – 2 C23 = 2 C33 = – 1

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