Question
\text { Let } A=\left[\begin{array}{llll} 4 & 0 & 0 & 1 \\ 0 & 2 & 2 & 3 \\ 5 & 3 & 1 & 1 \\ 0 & 2 & 1 & 8 \end{array}\right], b=\left[\begin{array}{l} 3 \\ 0 \\ 0 \\ 8 \end{array}\right] \text { and } x=\left[\begin{array}{l} x_{1} \\ x_{2} \\ x_{3} \\ x_{4} \end{array}\right] . Use Cramer's Rule to solve for x4 (wit
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