Given A= 2 -3 -4 -48 -7 6 -5 14 -69-12 (1) (a) Using elementary row operations, convert A into an upper -triangular matrix U.. Show all work. ▲ write out all elementary row operations in sequence order performed in the process (b) Convert each group of elementary row operations into an elementary matrix (c) Find the lower-triangular matrix such that A=LU. Show all work.

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