If L and U are invertible, then (LU)²001-U001L001 Find A001 from the given LU factorization: = -2 0 0 -2 0 0 18 -2 6 0 -7 A = LU A = -1 -2 7 7 H 1 -9 -3 0 1 -7 ][ 1 0 0 -1

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