Matrices

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 do m, n, p and q equal in this scalar matrix multiplication?

• m=8, n=9, p=-4, q=4 
• m=15, n = -45, p=20, q=-5
• m=20, n=-5, p=15, q=-45
• m=-5, n=20, p=-45, q=15

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

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

If the matrices can be multiplied, what dimension is the product? If not, write undefined.

• ( 3 x 1 )

• ( 3 x 2 )

• ( 3 x 3 )

• undefined

• A

• B

• C

• D

• E

Perform the matrix multiplication, if possible.

• 
• 
• 
• Cannot be multiplied, dimensions not compatible.

Perform the matrix multiplication, if possible.

• 
• 
• 
• Cannot be multiplied, dimensions not compatible.