Answer: ad - bc.
- A ac - bd
- B ab + cd
- C ad - bc
- D ab - cd
Correct answer: C. ad - bc
Explanation: det([[a,b],[c,d]]) = ad - bc. Multiply along the main diagonal and subtract the product along the other diagonal.
Element aij of matrix A sits at the intersection of row i and column j.
Concept context
Matrix operations, determinants, inverses, and solving linear systems