21.2.1. Matrix

Try these first

1. 1.

   Define a matrix.

   Hint

   Think about rows and columns.

2. 2.

   What is a row matrix?

   Hint

   It’s the opposite of a column matrix.

3. 3.

   What defines a matrix?

   • A single number
   • A rectangular array of numbers
   • A collection of shapes

   Hint

   Visualize how numbers might be arranged.

4. 4.

   True or false: A zero matrix has at least one non-zero element.

   • True
   • False

   Hint

   Think about what elements are present.

5. 5.

   Given the matrix A = [[1, 2, 3], [0, 4, 5]], determine the type of matrix and explain why.

   Hint

   Count the rows and columns carefully.

6. 6.

   Create a 3x3 identity matrix and demonstrate how multiplication with another matrix works.

   Hint

   Remember multiplication rules for matrices.