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Question

If A =[abba] and A2 =[xyyx] , then


A

x = a2 + b2 , y = 2ab

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B

x = 2ab, y = a + b

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C

x = a2 – b2 ,y = ab

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D

x = 2ab, y = a – b

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Solution

The correct option is A

x = a2 + b2 , y = 2ab


A=[abba]
A2=[abba][abba]=[a2+b2ab+abab+abb2+a2]=[xyyx]

Therefore x=a2+b2 and y = 2ab


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