Question

If A = `[(1, -2),(3, 0)], B = [(0, -2),(2, 1)]` find BA.

Answer 1

A = `[(1, -2),(3, 0)], B = [(0, -2),(2, 1)]`

BA = `[(0, -2),(2, 1)] [(1, -2),(3, 0)]`

= `[(0 xx 1 + (-2) xx 3, 0 xx (-2) + (-2) xx 0),(2 xx 1 + 1 xx 3, 2 xx (-2) + 1 xx 0)]`

= `[(-6, 0),(5, -4)]`