Q.

A is square matrix satisfying the equation  A2−4A−5I=O. Then  A−1=

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a

A−4I

b

13A−4I

c

14A−4I

d

15A−4I

answer is D.

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Detailed Solution

A2−4A−5I=O⇒AA−4I=5I⇒A−1=15A−4I
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