4.1 Matrices

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

To add or subtract matrices, which of the following must be true?

• They are the same matrix

• They have the same dimensions

• Rows in the 1st matrix must have the same # of terms as the columns as the 2nd matrix

• All matrices can be added

What is the name of each entry of a matrix?

• Row
• Element
• Dimension
• Rectangle

In Matrix R (pictured) what element is a₂₃?

• 8
• 9.01
• 6
• 1

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.

• A
• B
• C
• D

• 
• 
• 
• 

What is the type of this matrix?

• Column Matrix

• Identity Matrix

• Lower Triangular Matrix

• Null Matrix

What is a Matrix?

• An equation of over 5 numbers or symbols 
• A rectangular arrangement of numbers
• A method of finding the n^th value of a series
• A complicated number system

What would be the dimension of the matrix product AB?

If A_1X4 and B_4X7

• 1X7

• 4X4

• 4X7

• 7X1