Operating With Matrices

What is the entry in the 2nd row, 3rd column, when we add....

• 5

• 10

• 8

• 11

How many rows and columns does the matrix have?

• 2 Rows, 2 Columns

• 3 Rows, 2 Columns

• 2 Rows, 3 Columns

• 3 Rows, 4 Columns

What are the dimensions of this matrix?

• 3x1

• 2x3

• 4x2

• 3x2

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

• 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 2B-5A

• 
• 
• 
• 

Find 3B - 2A

• [22 25]

  [17 3]

• [14 5]

  [-11 3]

• [-14 5]

  [11 -3]

• none of these

Find 2A-3B

• -3 1

  7 -1

• 1 0

  1 -4

• -4 0

  6 -1

• -14 -5

  11 -3

Find the product of the two matrices.

• undefined

• -3   16
  17   12
  8   -10

• 3   12 
  -15  -8
  -1   -3

If the matrices can be multiplied, what dimension is the product? If not, write undefined.

• undefined

• ( 3 x 1 )

• ( 1 x 2 )

• ( 3 x 2 )

• A

• B

• C

• D