1.3 QUIZ Matrices

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.

What are the dimensions of matrix B?

• 2 x 3

• 3 x 2

• -8 x 10

• 3 x 3

Tags

CCSS.HSN.VM.C.6

How many rows are in a 7 x 3 matrix?

• 7

• 3

• 21

• 10

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

Add

• 11    8
  -4     2

• 3     2
  -6    -6

• -3    2
  -4    -6

• 10    8
  -6    2

Multiply -5 [5 -5 -1]

• [25 25 5]

• [-25 25 5]

• [-10 -10 -6]

• [10 10 6]

Can the operation be performed?

• Yes because there are 6 elements in each matrix

• No because the first matrix has negative elements

• Yes because the inner dimensions match even though the outer ones do not

• No because the dimensions don't match

Find A+B

• 8 10

  8 1

• 12 25

  7 1

• 10 30

  0 1

• undefined

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  

Name the dimensions.

• 2 x 4

• 4 x 2

• -2 x 6

• 1