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Exercises 9–14 require techniques from Section 3.1. Find the characteristic polynomial of each matrix, using either a cofactor expansion or the special formula for 3 × 3 determinants described prior to Exercises 15–18 in Section 3.1. [*Note*: Finding the characteristic polynomial of a 3 × 3 matrix is not easy to do with just row' operations, because the variable *λ* is involved.]

**9**.

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# Chapter 5 Solutions

EBK LINEAR ALGEBRA AND ITS APPLICATIONS

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