Question

What is the sum of

Answer 1

It's quite easy, just add the corresponding elements
I'll show you the first one\[\left[\begin{matrix}{3-5} & ? \\ ? & ?\end{matrix}\right]\]
Now you do the rest

Answer 2

Did you understand?

Answer 3

so its -2

Answer 4

Yeah that is the first row, first column element
Now do the same for the rest 3 and find the matrix

Answer 5

1

Answer 6

it 7 sorry

Answer 7

thanks