Find the Cofactor Matrix D=[[2,-9],[1,0]]

$D = [\begin{array}{c} 2 & - 9 \\ 1 & 0 \end{array}]$

Step 1

This is the adjoint of the original matrix.

$[\begin{array}{c} 0 & 9 \\ - 1 & 2 \end{array}]$

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