1.

Evaluate the following : [[2,-3,4],[-4,2,-3],[11,-15,20]]

Answer»

Solution :`[[2,-3,4],[-4,2,-3],[11,-15,20]]`
`2[[2,-3],[-15,20]]+3[[-4,-3],[11,20]]+4[[-4,2],[11,-15]]`
=2(40-45)+3(-80+33)+4(60-22)
=-10-141+152=-151+152=1


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