Matrix Operations

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 1 x 6

How many rows are in a 7 x 3 matrix?

Add

• 11    8

  -4     2

• 3     2

  -6    -6

• -3    2

  -4    -6

• 10    8

  -6    2

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  

Can the operation be performed?

• Yes

• No

• Who's to say?

• Only Mr. G and Mr. C might know

Find B-A

• -3 1

  7 -1

• 1 0

  1 -4

• 4 0

  -6 1

• not possible because rows do not match columns

How many columns are in a 5 x 4 matrix?

• 5
• 4
• 20
• 9

Find the determinant!

• -5

• -2

• 2

• 2x2

Find A+B

• 8     10

  8      1 

• 12     25

  7     1

• 10     30

  0     1

• 8 1

  8 10

Find the new matrix

• 12