Linear Algebra Examples

$[\begin{array}{c} - 4 & - 4 & - 9 & - 3 \\ 8 & 9 & 21 & 1 \\ 1 & 1 & 2 & 4 \end{array}]$

Step 1

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$[\begin{array}{c} - 4 & - 4 & - 9 & - 3 \\ 8 & 9 & 21 & 1 \\ 1 & 1 & 2 & 4 \end{array}]$