1.

If a3 xx 3square matrix satisfiesA^(3)-23A - 40 I = 0, " then "A^(-1)equals

Answer»

` (1)/(40)[23 -A^(2)]`
` -(1)/(40)[23 I- A^(2)]`
` (1)/(40)[23I -A^(2)]`
` (1)/(40)[A^(2) - 23]`

ANSWER :C


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