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A={:[( 1,1,1),(1,2,-3),(2,-1,3)]:} S...

`A={:[( 1,1,1),(1,2,-3),(2,-1,3)]:} `
Show that `A^(3) - 6A^(2) +5A +11 I =O. `Hence , find ` A^(-1) `

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The correct Answer is:
`A^(-1) =(1)/(11) {:[( -3,4,5),(9,-1,-4),(5,-3,-1)]:}`
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