Matrix Quiz Alternate

What must be true in order to SUBTRACT 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.

Add

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

Tags

CCSS.HSN.VM.C.8

How many rows are in a 7 x 3 matrix?

• 7
• 3
• 21
• 10

Multiply -5 [5 -5 -1]

• [25 25 5]

• [-25 25 5]

• [-10 -10 -6]

• [10 10 6]

Tags

CCSS.HSN.VM.C.7

Subtract

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

• -2   4   -9
  -1   -6   -17
• -8   12   -9
  1   6   17
• -8   4   -9
  15   6   7
• -2   -4   -9
  15   6    7

Can the operation be performed?

• Yes because there are 6 elements in each matrix

• No because the first matrix has negative elements

• Yes because matrices can always be added

• No because the dimensions differ

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

Find A+B

• 8     10
  8      1 
• 12     25
  7     1
• 10     30
  0     1
• can't add two together because the rows dont match columns

What are the dimensions of the following matrix

[3 6 -8 9] ?

• 4 x 1

• 2 x 2

• 1 x 4

• 3 x 1