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Question

If A = open square brackets table row 1 cell negative 2 end cell 3 row 4 0 cell negative 1 end cell row cell negative 3 end cell 1 5 end table close square brackets , then (adj A)23 =

  1. 13    
  2. – 13    
  3. 5    
  4. ­– 5    

The correct answer is: 13


    we are given with the matrix A and we need to find the adjacent of matrix A
    left parenthesis a d j. A right parenthesis subscript 23 space end subscript equals space C subscript 32
space c o f a c t o r space o f space a subscript 32 space end subscript
C subscript 32 equals left parenthesis negative 1 right parenthesis to the power of 3 plus 2 end exponent left parenthesis negative 1 minus 12 right parenthesis
space space space space space space space space equals 13

    Therfore we get the answer as 13

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