Respuesta :

we are given to find

[tex] a_2_3 [/tex]

we know that

[tex] a_i_j [/tex]

where

i is number of rows

j is number of column

Here , we get

i=2

and j=3

so,

[tex] a_2_3 [/tex] means second row and third column

we can look at matrix and find element

we can see that

that element is -21

so,

[tex] a_2_3 =-21[/tex]...........Answer

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