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If k is a scalar and I is a unit matrix ...

If `k` is a scalar and `I` is a unit matrix of order 3 then `adj(kI)` is equal to
(a) `k^(3)I`
(b) `k^(2)I`
(c) `-k^(3)I`
(d) `-k^(2)I`

A

(a) `k^(3)I`

B

(b) `k^(2)I`

C

(c) `-k^(3)I`

D

(d) `-k^(2)I`

Text Solution

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The correct Answer is:
b
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