Solve the linear system Ax = b by LU-Factorization showing DOOLITTLE'S METHOD. SHOW COMPLETE SOL. = 7 2x₁ + x₂ + x3 - X4 3x₂ + x3 - X4 = -3 -2x32 sul 2x1 + x₂ + x3 - 2x4 = 8 ben

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