Given the matrices in Problems 20-23, perform elementary row operations to obtain zeros under the 1 in
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Given the matrices in Problems 20-23, perform elementary row operations to obtain zeros under the 1 in the first column. Answers may vary.
\([C]=\left[\begin{array}{rrr:r}1 & 2 & 4 & 1 \\ -2 & 5 & 0 & 2 \\ -4 & 5 & 1 & 3\end{array}ight]\)
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