2331_quiz3

# 2331_quiz3 - 1 Math 2331 Quiz 3 Sections 2.3 2.6 2.7 This...

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Unformatted text preview: 1 Math 2331 Quiz 3 Sections 2.3, 2.6, 2.7 This is an online quiz; submit your answers using your CASA account. The instructions on how to submit this quiz are given on your instructorâ€™s website. Let E be the matrix that changes 2 1 3 2 5 2 4 14 6 A = into the upper triangular matrix 2 1 3 4 1 U d =- . That is, EA U = , where 32 31 21 E E E E = . 1. What is the 2-1 entry of E ? a) 1 b) -1 c) -3 d) -2 e) 6 f) none of these 2. What is the 3-1 entry of E ? a) 1 b) -1 c) -3 d) -2 e) 6 f) none of these 3. What is d ? (the 3-3 entry of U ) a) 3 b) 6 c) 9 d) 12 e) -3 f) none of these Questions 4-5: Let 1 2 3 4 2 8 5 A = - . Find the LU decomposition of A. 4. L = a) 1 3 1 4 1 - b) 1 3 1 4 1 - - c) 1 3 1 4 1 - d) 1 3 1 4 1 e) none of these...
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2331_quiz3 - 1 Math 2331 Quiz 3 Sections 2.3 2.6 2.7 This...

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