Matrix Operations

What must be true in order to ADD two matrices?

• They must be square.

• Their dimensions must be equal.

• The number of columns of the 1st must equal the number of rows of the second.

• The number of rows of the 1st must equal the number of columns of the second.

Tags

CCSS.HSN.VM.C.8

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• undefined

Tags

CCSS.HSN.VM.C.6

How many columns are in a 5x4 matix?

• 5

• 4

• 20

• undefined

Tags

CCSS.HSN.VM.C.6

Subtract

• -5
  -8
  3
  10
• -9
  8
  3
  2
• 5
  -8
  3
  10
• -5
  8
  3
  2

In Matrix R (pictured) what element is in the second row, third column?

• 8
• 9.01
• 6
• 1

Add

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

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

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  

Subtract

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

Find B-A

• -3     1
  7     -1
• 1     0
  1     -4
• 4       0
  -6     0
• not possible because rows do not match columns