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If A=[(1,2),(4,3)] then A^2-4A=?...

If `A=[(1,2),(4,3)] then A^2-4A`=?

A

I

B

5I

C

3I

D

0

Text Solution

Verified by Experts

The correct Answer is:
B
`A^2-4A=[(1,4),(2,3)][(1,4),(2,3)]-[(4,16),(8,12)]=[(9,16),(8,17)]-[(4,16),(8,12)]=[(5,0),(0,5)]=5I`
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