$\"\"$

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The matrices are $\"\"$ and $\"\"$ .

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Find $\"\"$ .

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$\"\"$

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$\"\"$ .

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First find $\"\"$ .

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$\"\"$

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Let $\"\"$ , then $\"\"$ .

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$\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$ , then $\"\"$ has an inverse.

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$\"\"$

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Cofactor of $\"\"$ is

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Find $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in $\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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The matrix $\"\"$ is $\"\"$ .