Question: In each case find an invertible matrix U such that UA = R is in reduced row-echelon form, and express U as a product of

In each case find an invertible matrix U such that UA = R is in reduced row-echelon form, and express U as a product of elementary matrices.
(a)
In each case find an invertible matrix U such that

(b)

In each case find an invertible matrix U such that

(c)

In each case find an invertible matrix U such that

(d)

In each case find an invertible matrix U such that

1-1 2 -2 10 5 12 -1 12-10 A=13 1 1.2 1-3 3 2 123 112 231

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