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Which of the following matrice is invertible? [[2,1,-2],[1,2,1],[3,6,4]] |
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Answer» Solution :LET A=`[[2,1,-2],[1,2,1],[3,6,4]]` `therefore ABSA =[[2,1,-2],[1,2,1],[3,6,4]]` =`2[[2,1],[6,4]]-1[[1,1],[3,4]]-2[[1,2],[3,6]]` =2(8-6)-(4-3)-2(6-6) =4-1-0=`3 ne 0` |
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