Example 1:1
Example 2:
1 2
-1 3
Example 3:
i 0
0 -1
Example 4:
0 0 0
0 0 1
In each of these example, you need to add square brackets around the set of numbers.
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Unless your "everyday life" involves work in some area of engineering, you won't use matrices in your everyday life.
The matrices must have the same dimensions.
Only square matrices have a determinant
There are no matrices in the question!
In mathematics matrices are made up of arrays of elements.