Question

If A = `((1, -2, 3),(-4,2,5)) and B = ((2,3),(4,5),(2,1))` and BA = (b_ij), find b₂₁ + b₃₂.

Answer 1

b₂₁ = - 16, b₂₃ = - 2      ....[ For any one correct value ]
b₂₁ + b₂₃ = - 16 + (- 2) = - 18.