Multiply Matrices

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 product.

• undefined

• -3   16
  17   12
  8   -10

• 3   12 
  -15  -8
  -1   -3

You can multiply a 2X3 matrix by which matrix?

• 2X2

• 2X12

• 3X12

• 2X3

Find the product of the two matrices.

• undefined

• -3   16
  17   12
  8   -10

• 3   12 
  -15  -8
  -1   -3

• 17   12
  25   18
• 8   9
  12   6
• 6   6
  7   5
• 12   10
  10   12

Find the product of the two matrices.

• Undefined

• 
• 
• Identity Matrix

What multiplication would you do to find row 1, column 1 in the product matrix? (Write it down, you'll need it later)

• 1(1) + -2(2)

• 1(-1) + -2(2)

• 3(1) + -4(2)

• 3(-1) + -4(2)

• 
• 
• 
• 

• A

• B

• C

• D

• E

• A

• B

• C

• D