Matrices Practice

What must be true in order to ADD two matrices?

• They must be square.
• The dimensions must be equal.
• The determinant can't equal 0.
• The column of the 1st must equal the row of the 2nd.

You can multiply a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

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

• 8
• 9.01
• 6
• 1

Add

• 11    8
  -4     2
• 3     2
  -6    -6
• -3    2
  -4    -6
• 10    8
  -6    2

Subtract

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

what come first in the order

• column 
• Row 

Dimensions?

• a
• b
• c
• d

Element Address?

• a
• b
• c
• d

Multipy the matrices.

• 17 12

  25 18

• 8 9

  12 6

• 6 6

  7 5

• 12 10

  10 12

Multipy the matrices.

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