Tolong ajarin caranya yaaa

[2 1] [-1 1]
[0 -1] [0 2]

= [2.-1+1.0 2.1+1.2]
[0.-1+-1.0 0.1+-1.2]

= [-2+0 2+2]
[0+0 0+-2]

= [-2 4]
[0 -2]

Math so easy and simple