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  • If A is a square matrix of order 3, with | A |= 9, then write the value of

If A is a square matrix of order 3, with \left | A \right |= 9, then write the value of  \left | 2\cdot adj\: A \right |.

 

 

 

 
 
 
 
 

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\left | 2adj\: A \right |= 2^{3}\left | adj\: A \right |= 8\times \left | A \right |^{3-1}= 8\times 9^{2}= 648

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