In Exercises 39 and 40, A is an $n \times n$ matrix. Mark each statement True or False. Justify each answer.

a. The cofactor expansion of det *A* down a column is equal to the cofactor expansion along a row.

b. The determinant of a triangular matrix is the sum of the entries on the main diagonal.

The cofactor

hansel

Answered by Aaron 2 years ago

**part a**

True, the expansion along any row or column will give you the same determinant

**part b**

False, the determinant of a triangular matrix is the **product** of the entries on the main diagonal.

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Asked: 2 years ago