Book
Advanced Engineering Mathematics
Author
Erwin Kreyszig
Edition
8th Edition
M =MatrixSpace(QQ,3,3) A=M([0,6,13,6,0,-8,13,-8,0]) b=vector([61,-38,79]) B=matrix([b]) C=A.augment(B.transpose()) print C C.rescale_row(2,1/13) C.rescale_row(1,1/6) C.add_multiple_of_row(1,2,-1) C.add_multiple_of_row(2,1,1) C.rescale_row(0,1/6) C.rescale_row(1,-13/8) C.add_multiple_of_row(0,1,1) C.rescale_row(0,3/13) z=C[0,3] x=C[2,3]+C[2,2]*z y=C[1,2]*z-C[1,3] print x,y,z
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