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If A = ({:( 1,2,3),( 2,1,2),( 2,2,1) :})...

If A `= ({:( 1,2,3),( 2,1,2),( 2,2,1) :}) and A^(2) -4A -5l =O ` where I and O are the unit matrix and the null matrix order 3 respectively if ,` 15A^(-1) =lambda |{:( -3,2,3),(2,-3,2),(2,2,-3):}|` then the find the value of ` lambda `

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