[9 4];[2 1] X= [-9 -6];[-1 -8]

Question

(Answer is a matrix)

Answer 1

[9 4]
[2 1] X [-9 -6]
[-1 -8]

= [ (9*-9 + 4*-1) (9*-6 + 4*-8) ]
[ (2*-9 + 1*-1) (2*-6 + 1*-8) ]

= [ -81 -90 ]
[ -19 -22 ]