# Since a is triangular the sum along the diagonal det

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SinceAis triangular,the sum along thediagonal.det(A) = 0.det(A) = 0.det(A) = 0.det(A) = (1)(8)(0)(−4) = 0,det(A) = 1 + 8 + 0 + (−4) = 5,
11/30/2017UW Common Math 308 Section 5.18.2/2 points |Previous AnswersHoltLinAlg2 5.1.039.Find det(A). No cofactor expansions are required.
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9.2/2 points |Previous AnswersHoltLinAlg2 5.1.048.Determine all possible real values ofλsuch thatfor the given matrixA. (Enter youranswers as a comma-separated list. If an answer does not exist, enter DNE.)10.3/3 points |Previous AnswersHoltLinAlg2 5.1.050.Find all possible real valuesλsuch that(Enter your answers as a comma-separated
list. If an answer does not exist, enter DNE.)
11/30/2017UW Common Math 308 Section 5.111.5/5 points |Previous AnswersHoltLinAlg2 5.1.053.For each given matrixA, first compute det(A). Then interchange two rows of your choosing and computethe determinant of the resulting matrixA'.(a)(b)Form a conjecture about the effect of row interchanges on determinants.A=435det(A) =26det(A') =-26A=13−120301−1det(A) =det(A') =-121
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