Reading the definitions back

Exercise and reference answers

Questions

1. Question

   A matrix is singular when

   Choices

   1. |A| = 1
   2. |A| = 0
   3. |A| ≠ 0

   Correct choice

   |A| = 0

2. Question

   adj A is built from

   Choices

   1. minors
   2. the leading diagonal
   3. cofactors, transposed

   Correct choice

   cofactors, transposed

3. Question

   The minor M₁₁ is found by deleting

   Choices

   1. row 1 and column 1
   2. row 1 only
   3. the diagonal

   Correct choice

   row 1 and column 1

4. Question

   Determinants are defined for

   Choices

   1. any matrix
   2. square matrices
   3. row matrices only

   Correct choice

   square matrices

Explanation