Matrices Dimensions Elements

What is matrix multiplication?

• Multiplying the corresponding elements of two matrices together.

• Subtracting the corresponding elements of two matrices.

• Dividing the corresponding elements of two matrices.

• Multiplying the rows of the first matrix with the columns of the second matrix.

What do w, x, y and z equal in this matrix subtraction?

• w = 13, x = 4, y = 7, z = 23

• w = 13, x = -4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 23

• w = 13, x = 4, y = 11, z = 17

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

• 8

• 9.01

• 6

• 1

• A
• B
• C
• D

What do a, b, c and d equal in this matrix addition?

• a = -1, b = 10, c = 7, d = -11

• a = -1, b = 10, c = -11, d = 7

• a = 10, b = -1, c = 7 , d = -11 

• a = 10, b = -1, c = -11, d = 7

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

• A
• B
• C
• D

• A
• B
• C
• D

What is a Matrix?

• An equation of over 5 numbers or symbols 

• A set of numbers in rows and columns

• A method of finding the n^th value of a series

• A complicated number system

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