Matrices and Determinants

If a matrix has 18 elements, what are the possible orders it can have?

• 5

• 6

• 7

• 8

        If A is a square matrix such that 𝐴(𝑎𝑑𝑗 𝐴)  =  8𝐼, where I denotes the identity matrix of the same order, then find the value of|𝐴|.

• 8

• 64

• 2

• NONE OF THESE

In Matrix R (pictured) what is the value of element R_3,2

• 8

• 9.01

• 6

• 1

What are the dimensions of matrix A?

• a

• b

• c

• d

• B

• A

• C

• D

Evaluate the determinant of the matrix.

• -21

• 0

• 9

• 12

• 4

• 8

• 3

• 6

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

• 
• 
• 
• 

find: B*A

• 47     30
  9     5

• 17     15
  42     35

• 10     25
  7     1

• not possible because rows do not match columns