Review Matrices

Find the product of the two matrices.

• 1   2
  6   -8
• -3   -5
  -5   -11
• -2     8
  -6   -12
• 2  -3
  5   -2

Can the operation be performed?

• Yes

• No

• I Don't Know

• Maybe

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

You can multiply a 6X2 matrix by which matrix?

• 6X2
• 2X12
• 3X12
• 6x3

What is the value of element a₂₃?

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

Multiply

• 20     15    -10
  30     -5         0
• -20      15     -10
  30     -5          0
• 1        8       3
  11     4        5
• 20     -15     10
  -30         5        0  

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

Perform the indicated operation.  If it’s not possible, select Not Possible. 

• 7
  -7
  -6
  20
• 7 
  -9
  -6
  20
• Not Possible
• 7
  -9
  2
  20

Can the operation be performed?

• Yes

• No

• often

• Maybe