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Unformatted text preview: dc . Are they equal? (b) Given I = 1 1 , b = 3 4 ! " # $ % & , and x = 2 1 x x , compute Ib . Is Ib equal to b ? Again, compute Ix. Is Ix equal to x ? (c) Given E 1 = 1 2 1 , E 2 = 1 3 1 , E 3 = 4 1 1 , E 4 = 1 2 1 and A = 2 3 4 2 , compute E 1 A , E 2 (E 1 A) , E 3 (E 2 E 1 A) , and E 4 (E 3 E 2 E 1 A) . Describe what is happening with rows as you multiply your matrices by E 1 , E 2 , E 3 , and E 4 , respectively. What do you notice is happening with the rows of resulting matrices (what are these matrices E 1 , E 2 ,., E 4 doing to the matrix they are multiplying from the left)?...
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 Fall '08
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