Ex. Find a sequence of elementary mutricies if there whose product is mutricies A 3 8 J Sal A = [-38 1 23 38 Loz and only where Therefore ( 21 (- 2) M 2 (2 ) (12(- 3) M, (- ) A =I of AW Multiply all elementary matricies and confirm AT. ( 21 ( - 2) -7 Row 2X - 2, + Row ! ? . M2( 1 12 ) - ) and ROW x 1/2. the . ( 12 1 - 3 ) - ROW 1 X - 3, + ROW 2 . Start with Identify matrix, 4 steps. Equivalent conditions atrix then the following