For the matrices in Exercises 17–20, (a) find k such that Nul A is a subspace of ℝ k , and (b) find k such that Col A is a subspace of ℝ k 17 . A = [ 2 − 6 − 1 3 − 4 12 3 − 9 ]
For the matrices in Exercises 17–20, (a) find k such that Nul A is a subspace of ℝ k , and (b) find k such that Col A is a subspace of ℝ k 17 . A = [ 2 − 6 − 1 3 − 4 12 3 − 9 ]
Compute the determinants in Exercises 9–14 by cofactor expansions. At each step, choose a row or column that involves the least amount of computation.
Compute the determinants in Exercises 7–15 using cofactorexpansion along any row or column that seems convenient.
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Compute the determinants in Exercises 1–8 using a cofactor expansion across the first row. In Exercises 1–4, also compute the determinant by a cofactor expansion down the second column.
Chapter 4 Solutions
Thomas' Calculus and Linear Algebra and Its Applications Package for the Georgia Institute of Technology, 1/e
Introductory and Intermediate Algebra for College Students (5th Edition)
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