Allied & ICAR Exam Bank • ALLIED_2618 MCQ • 1 Mark

Section 1: Engineering Mathematics

Linear Algebra

Subtopic: Cayley–Hamilton theorem

Question Statement:

If $A$ is a square matrix satisfying $A^3 = 0$ (nilpotent of index 3), then $(I - A)^{-1}$ is:

Options:

  • (A) $I + A + A^2$
  • (B) $I - A + A^2$
  • (C) $I - A^2$
  • (D) $A + A^2$

Answer Key:

A

Step-by-Step Solution & Explanation

Since $(I - A)(I + A + A^2) = I - A^3 = I - 0 = I$, the inverse is $I + A + A^2$.
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