Matrices Practice

What is the entry at r₃₁?

• 3

• 1

• 4

• 7

What is the address of 8?

• R₂₃

• R₃₂

• r₂₃

• r₃₂

What must be true in order to ADD two matrices?

• They must be square.

• The dimensions must be the same.

• 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

Subtract

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

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 this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

Multiply by the scalar

• 20 15 -10

  30 -5 0

• -20 15 -10

  30 -5 0

• 1 8 3

  11 4 5

• 20 -15 10

  -30 5 0

Tags

CCSS.HSN.VM.C.7

Name the dimensions (hint: think of rows then columns)

• 6x2
• 2x6
• 3x2
• 2x3

Dimensions?

• a
• b
• c
• d