Matrix Test

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.

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

Add.

• No Sum Exists

• 
• 
• 

Name the dimensions:

• 6x2
• 2x6
• 12
• 36

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  

Perform the scalar multiplication. 

​ (a)   ​ (b)  

​ (c)   ​ (d)  

• -1
• 3
• 9
• -16
• -2
• 36
• 6
• -64
• -4
• -12

Perform the scalar multiplication.

• 
• 
• 
• 

Perform scalar multiplication on the matrix

• A
• B
• C
• D