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2). [5 -4] [2 -1]
[3 1] [6 -2]
= [5x2+-4x6 5x-1+-4x-2]
[3x2+1x6 3x-1+1x-2 ]
= [10+24 -5+8 ]
[6+6 -3+(-2) ]
= [34 3 ]
[12 5 ]