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Which relation is true for A =[(2,-1),(-...

Which relation is true for `A =[(2,-1),(-1,2)]` and `B=[(1,4),(-1,1)]` (1) `(A+B)^2=A^2+2AB+B^2` (2) `(-B)^2=A^2-2AB+B^2` (3) AB=BA (4) None of these

A

`(A+B)^(2)=A^(2)+2AB+B^(2)`

B

`(A-B)^(2)=A^(2)-2AB+B^(2)`

C

AB = BA

D

None of these

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The correct Answer is:
D
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MOTION-MATRICES -Exercise - 1
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