Answer: In 21-30, proceed as in Example 5 and use the corresponding LU-factorization
Chapter 8, Problem 28(choose chapter or problem)
In 21-30, proceed as in Example 5 and use the corresponding LU-factorization from 1-10 to solve the given linear system of equations.( -4 2 -lQ)(X1) - ( -20 28. 4 1 4 Xz - 14 )
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