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# Fill in the blank(s) using elementary row operations to form a row-equivalent matrix.$\left[\begin{array}{rrrr}{1} & {1} & {4} & {-1} \\ {3} & {8} & {10} & {3} \\ {-2} & {1} & {12} & {6}\end{array}\right] \\ \left[\begin{array}{cccc}{1} & {1} & {4} & {-1} \\ {0} & {5} & {?} & {?} \\ {0} & {3} & {?} & {?}\end{array}\right] \\ \left[\begin{array}{llll}{1} & {1} & {4} & {-1} \\ {0} & {1} & {?} & {?} \\ {0} & {3} & {?} & {?}\end{array}\right]$

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Answered 2 years ago
Answered 2 years ago
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Our goal is to determine the value of unknown entries by applying elementary row operations.

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