Question

B =


1 −1 3 2
1 2 −1 1
4 3 −2 4
1 2 −2 1



Answer 1

$1 - 132 \\ = - 131$

$12 - 11 \\ = 1$

$43 - 24 \\ = 19$

$12 - 21 \\ = - 9$