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If A equals open parentheses table row 1 2 0 row 0 1 2 row 2 0 1 end table close parentheses comma then adj A

  1. open parentheses table row 1 4 cell negative 2 end cell row cell negative 2 end cell 1 4 row 4 cell negative 2 end cell 1 end table close parentheses    
  2. open parentheses table row 1 cell negative 2 end cell 4 row 4 1 cell negative 2 end cell row cell negative 2 end cell 4 1 end table close parentheses    
  3. open parentheses table row 1 2 4 row cell negative 4 end cell 1 2 row cell negative 4 end cell cell negative 2 end cell 1 end table close parentheses    
  4. None of these    

The correct answer is: open parentheses table row 1 cell negative 2 end cell 4 row 4 1 cell negative 2 end cell row cell negative 2 end cell 4 1 end table close parentheses


    A equals open square brackets table row 1 2 0 row 0 1 2 row 2 0 1 end table close square brackets,
    A subscript 11 end subscript equals 1 comma A subscript 21 end subscript equals negative 2 comma A subscript 31 end subscript equals 4
    A subscript 12 end subscript equals 4 comma A subscript 22 end subscript equals 1 comma A subscript 32 end subscript equals negative 2
    A subscript 13 end subscript equals negative 2 comma A subscript 23 end subscript equals 4 comma A subscript 33 end subscript equals 1
    A d j left parenthesis A right parenthesis equals open square brackets table row 1 cell negative 2 end cell 4 row 4 1 cell negative 2 end cell row cell negative 2 end cell 4 1 end table close square brackets.

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