Two true, one false: scope of the chapter

Exercise and reference answers

Questions

1. False statement

   The chapter proves that swapping two rows changes the sign

   Statements

   1. The chapter proves that swapping two rows changes the sign
   2. The chapter gives the area of a triangle as a determinant
   3. The chapter defines the adjoint of a matrix

2. False statement

   adj A = A⁻¹ × |A|²

   Statements

   1. A⁻¹ = adj A ÷ |A|
   2. adj A = A⁻¹ × |A|²
   3. A (adj A) = |A| I

Explanation