00:01
Hi, the question is asking us to write the matrix knowing the element of the matrix and what is the dimension.
00:09
So the matrix has rows and columns.
00:12
I'm going to write here a11.
00:15
That's the first row, first column.
00:18
A12, a2, a22, that means 21.
00:24
That's the second row, first column, and a a22.
00:29
So if you understand this matrix, which is a 21, that means 21, that's the second row first column, and a 22.
00:32
Is a very basic at 2 by 2.
00:35
So we call this a 2 by 2 matrix...