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Using elementary transformations, find t...

Using elementary transformations, find the inverse of the matrix`[[2, 0,-1],[ 5, 1, 0],[ 0, 1 ,3]]`

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Let A=`[[2, 0,-1],[ 5, 1, 0],[ 0, 1 ,3]]`
`A=IA`
`[[2, 0,-1],[ 5, 1, 0],[ 0, 1 ,3]]``=``[[1,0,0],[0,1,0],[0,0,1]].A`
`Apply R _ 2 ​ ↔R _ 1`
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