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Unformatted text preview: MATH111 HW 7 Due Date: 29th, Oct, 2007 (Mon) Please hand in your homework in the tutorial session or by putting it in the collection box outside MATH dept (Rm 3461, Lift 2526). Ch 2.9 # 6 In the following exercise, the vector x is in a subspace H with a basis B = { b 1 , b 2 } . Find the Bcoordinate vector of x . b 1 =  3 1 4 , b 2 = 7 5 6 , x = 11 7 , Ch 2.9 # 10 In the following the matrix A and an echelon form of A is displayed. Find bases for Col A and Nul A , and then state the dimensions of these subspaces. A = 1 2 9 5 4 1 1 6 5 3 2 6 1 2 4 1 9 1 9 ∼ 1 2 9 5 4 1 3 7 1 2 Ch 2.9 # 16 Suppose a 4 × 7 matrix A has three pivot columns. Is Col A = R 3 ? What is the dimension of Nul A ? Explain your answer. Ch 2.9 # 18 In the following exercise, mark each statement True or False. Justify each answer. Here A is an m × n matrix....
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 Spring '07
 Cheng
 Math, Linear Algebra, Algebra, Vector Space, linearly independent set, Col A

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