Question

matriz A(3;4) B(2;5) e C(-3;3)

Answer 1

3...4...1
2...5...1
-3..3...1

(3.5.1 +2.3.1 + 4.1.(-3)) - (1.5.(-3)+2.4.1+3.1.3) = 
(15+6-12) - (-15+8+9) = 
9 - (2) = 9-2 = 7