Multiply 2x2 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 of the two matrices.

• 17   12
  25   18

• 8   9
  12   6

• 6   6
  7   5

• 12   10
  10   12

Find the product of the two matrices.

•   2
  6   -8

•   -5
  -5   -11

•     8
  -6   -12

• -3
  5   -2

• A

• B

• C

• D

• E

• A

• B

• C

• D

• 
• 
• 
• 

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

• A

• B

• C

• D

• E

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