Matrices

Add

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

Tags

CCSS.HSN.VM.C.8

Subtract

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

Tags

CCSS.HSN.VM.C.8

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

Tags

CCSS.HSN.VM.C.8

What do m, n, p and q equal in this scalar matrix multiplication?

• m=8, p=-4,

  n=9, q=4 

• m=15, p=20,

  n = -45, q=-5

• m=20, p=15,

  n=-5, q=-45

• m=-5, p=-45,

  n=20, q=15

What are the dimensions of this matrix?

• 2 x 3

• 3 x 2

• 6 x 1

• 1 x 6

Answer explanation

Rows are horizontal and come first.

Columns are vertical and come second.

There were three rows and two columns.

Perform the indicated operation.  If it’s not possible, select Not Possible. 

• 7
  -7
  -6
  20
• 7 
  -9
  -6
  20
• Not Possible
• 7
  -9
  2
  20

Tags

CCSS.HSN.VM.C.8

find: A*B

• [47   30]

  [ 9     5]

• [17   15]

  [42 35]

• [10  25]

  [7     1]

• not possible because rows do not match columns

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  

Tags

CCSS.HSN.VM.C.8

Subtract

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

Tags

CCSS.HSN.VM.C.8

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

• 8
• 9.01
• 6
• 1

Tags

CCSS.HSN.VM.C.6