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Which of the following matrice is invertible? [[-1,-2,3],[2,1,-4],[-1,0,2]] |
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Answer» Solution :LET A=`[[-1,-2,3],[2,1,-4],[-1,0,2]]` `THEREFORE absA =[[-1,-2,3],[2,1,-4],[-1,0,2]]` =`-1[[1,-4],[0,2]]+2[[2,-4],[-1,2]]+3[[2,1],[-1,0]]` =-(2-0)+(4-4)+3(0+1) =2+0+3=`1 ne 0` `therefore` A is invertible. |
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