ANSWER
[tex]a_{34} = 8[/tex]
EXPLANATION
The given matrix is a 4 by 4 matrix.
The entry in the intersection of the first third row and the fourth column is denoted
[tex]a_{34}[/tex]
This entry is 8.
Check the attachment for how we got the 8.
Therefore
[tex]a_{34} = 8[/tex]
