QUIZ 2 (C4 : Matrices)

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Which option below correctly shows the steps to find the inverse of this matrix?

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• No Inverse Exists

1. Let A be a square matrix of order 3x3 then| kA| = .

• k |A|

• k²|A|

• k³|A|

• 3k|A|

What is the determinant of this matrix?

• 0

• 24

• -24

• -12

Evaluate the determinant of the matrix.

• 68

• -49

• -83

• -75

Evaluate the determinant of the matrix.

• 695

• 284

• 392

• -179

Calculate the

 $m_{23\ }and\ \ c_{23}$  

•  $m_{23}=12,\ \ c_{23}=12$  

•  $m_{23}=12,\ \ c_{23}=-12$  
  

•  $m_{23}=-20,\ \ c_{23}=-20$  

•  $m_{23}=-20,\ \ c_{23}=20$  
  

. Let A be a square matrix of order 2 × 2, then |KA| is equal to

• K|A|

• K²|A|

• K3|A|

• 2K|A|

Which of the following are NOT inverse matrices of each other?

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Solve for x and y.

• x = -4 and y = 2

• x = -9\2 and y = 2

• x = 9/2 and y = -2

• x = -5 and y = 1