Matrices in the Real World

Add

• 
• 
• 
• 

Subtract

• -5

  -8

  3

  10

• -9

  8

  3

  2

• 5

  -8

  3

  10

• -5

  8

  3

  2

Find A-B

• 
• 
• 
• not possible because rows do not match columns

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

In Matrix R (pictured) what is the value of element R₃₂

• 8

• 9.01

• 6

• 1

What are the dimensions?

• 5 x 3

• 3 x 5

• 3 x 15

• 12 x 3

You can add a 2X3 matrix by which matrix?

• 2X2
• 2X12
• 3X12
• 2X3

find: 2B + A

• 
• 
• 
• not possible because rows do not match columns

A number outside of a matrix is called what?

• real
• multiplier
• scalar
• rational

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.