Answer: I + A.
- A I − A
- B I + A
- C I
- D A
Correct answer: B. I + A
Explanation: (I − A)(I + A) = I − A² = I, so (I − A)⁻¹ = I + A.
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