Question

If A = `[(3, 1),(-1, 2)], B = [(1, 0),(0, 2)],` find B².

Answer 1

B = `[(1, 0),(0, 2)]`

B² = `[(1, 0),(0, 2)] [(1, 0),(0, 2)]`

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

= `[(1, 0),(0, 4)]`