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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