Matrices Practice

What size is this matrix?

• 2x2

• 2x3

• 3x2

• 1x6

What do w, x, y and z equal in this matrix subtraction?

• w = 13, x = 4, y = 7, z = 23
• w = 13, x = -4, y = 11, z = 23
• w = 13, x = 4, y = 11, z = 23
• w = 13, x = 4, y = 11, z = 17

Find

• 11 8

  -4 2

• 3 2

  -6 -6

• -3 2

  -4 -6

• 10 8

  -6 2

Evaluate the determinant of the matrix.

• -21
• 0
• 9
• 12

Evaluate the determinant of the matrix.

• -21
• 0
• 9
• 12

Determine if the matrix has an inverse, if so find it.

• No
•  0   1
  -1   2
• -1   3
    1   -2
•   2   -1
  -1   1

Multiply

• 20     15    -10
  30     -5         0
• -20      15     -10
  30     -5          0
• 1        8       3
  11     4        5
• 20     -15     10
  -30         5        0  

What is A^-1?

• 
• 
• 
• 

find: B*A

• 47     30
  9     5
• 17     15
  42     35
• 10     25
  7     1
• not possible because rows do not match columns

Find the inverse of the matrix.

• 
• 
• 
• No Inverse Exists