Given the matrices in Problems 28-31, perform elementary row operations to obtain a zero (or zeros) above

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Given the matrices in Problems 28-31, perform elementary row operations to obtain a zero (or zeros) above and below the 1 in the second column without changing the entries in the first column.

$[B]=\left[\begin{array}{rrr:r}1 & 3 & 6 & 12 \\ 0 & 1 & -2 & -5 \\ 0 & -2 & 2 & 6\end{array}ight]$

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Nature Of Mathematics

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Given the matrices in Problems 28-31, perform elementary row operations to obtain a zero (or zeros) above

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