2/8 QUIZ

What is an element in a matrix?

How are the dimensions of a matrix expressed? Columns x Rows or Rows x Columns?

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

Name the order of this matrix.

• 6x2

• 2x6

• 12

• 36

How many columns are in a 5 x 4 matrix?

• 5

• 4

• 20

• 9

In Matrix R (pictured) what element is r₂₃?

• 8

• 9.01

• 6

• 1

How many rows are in a 7 x 3 matrix?

• 7

• 3

• 21

• 10

Subtract

• -5
  -8
  3
  10

• -9
  8
  3
  2

• 5
  -8
  3
  10

• -5
  8
  3
  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  

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.