Matrix Test Review

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

• 8

• 9.01

• 6

• 1

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 )

Which of the following must be true for a matrix to be invertible? Choose all that apply.

• The matrix must be square.

• The determinant must be zero.

• The determinant must not be zero.

• The matrix cannot have any negative entries.

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

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• 
• 
• 

Find 3B - 2A

• [22 25]

  [17 3]

• [14 5]

  [-11 3]

• [-14 5]

  [11 -3]

• none of these

Which element is located in A₂₃?

• -3

• 5

• -9

• 2

What is a Matrix?

• An equation of over 5 numbers or symbols

• A set of numbers in rows and columns

• A method of finding the n^th value of a series

• A complicated number system

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• 
• 

Find 2A-3B

• -3 1

  7 -1

• 1 0

  1 -4

• -4 0

  6 -1

• -14 -5

  11 -3