Question

What is the dimension of the matrix `[(6,-1,5),(-2,3,-4)]`?

Answer 1

This is a rectangular matrix of dimension `2xx3` (read as "two-by- three" matrix).

Explanation:

You can "read" the dimension by counting the number of rows and of columns expressing your dimension as:
`"number of rows"xx"number of columns"`

This dimension can be particularly useful when you multiply matrices because it will give you a definite condition to be able to operate the multiplication.