solve: x_{1}-2 x_{2}-x_{3}+3 x_{4}=4 2 x_{1}+x_{2}+x_{3}-4 x_{4}=3 3 x_{1}-x_{2}-2 x_{3}+2 x_{4}=6 x_{1}+3 x_{2}-x_{3}+x_{4}=8 Determine the four fourth roots of the complex number Z = 3 – 4j , using DeMoivre's theorem and express their values in cartesian form.
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