Question 1192831
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Use this LU-decomposition online calculator for free


https://www.emathhelp.net/en/calculators/linear-algebra/lu-decomposition-calculator/



On the theory,  see your textbook and/or these Internet-sources


https://www.geeksforgeeks.org/l-u-decomposition-system-linear-equations/


https://en.wikipedia.org/wiki/LU_decomposition