1.

Which of the following matrice is invertible? [[-1,-2,3],[2,1,-4],[-1,0,2]]

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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