Matrices

find: B*A. Remember, ORDER MATTERS!

• 47 30

  9 5

• 17 15

  42 35

• 10 25

  7 1

• not possible because rows do not match columns

Multiply the following matrices

• 
• 
• 
• 

These matrices are being multiplied. Determine the dimension/size of the new matrix. 

• Can't multiply them

• 4  x  2

• 3  x  3

• 4  x  3

What is the second element?

• Undefined

• 
• 
• 

Matrices: Multiplying Matrices

• 19 -9

  30 -2

• -19 -9

  -28 4

• -10 -12

  -30 -2

• 14 9

  -28 -2

Matrix A and B have orders 3 x 2 and 2 x 4, what is the order of the of AB ?

• 3 x 2

• 2 x 4

• 2 x 2

• 3 x 4

Can the operation be performed?

• Yes
• No
• tomato
• Maybe

Multiply

• 
• 
• 
• 

find: AB

• 47 30

  9 5

• 17 15

  42 35

• 10 25

  7 1

• not possible because rows do not match columns