Solve the equation Axequals b by using the LU factorization given for A. Also solve Axequals b by ordinary row reduction. Aequals [Start 3 By 3 Matrix 1st Row 1st Column 4 2nd Column negative 5 3rd Column negative 4 2nd Row 1st Column negative 4 2nd Column 1 3rd Column 3 3rd Row 1st Column 12 2nd Column 5 3rd Column negative 8 EndMatrix ]equals[Start 3 By 3 Matrix 1st Row 1st Column 1 2nd Column 0 3rd Column 0 2nd Row 1st Column negative 1 2nd Column 1 3rd Column 0 3rd Row 1st Column 3 2nd Column negative 5 3rd Column 1 EndMatrix ][Start 3 By 3 Matrix 1st Row 1st Column 4 2nd Column negative 5 3rd Column negative 4 2nd Row 1st Column 0 2nd Column negative 4 3rd Column negative 1 3rd Row 1st Column 0 2nd Column 0 3rd Column negative 1 EndMatrix ], bequals [Start 3 By 1 Matrix 1st Row 1st Column 12 2nd Row 1st Column negative 22 3rd Row 1st Column 92 EndMatrix ]