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Question

What is the expansion for the identity (ab)2?

A
a2b2
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B
(a2+b2+ab)
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C
(a2b22ab)
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D
(a2+b22ab)
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Solution

The correct option is D (a2+b22ab)
(ab)2=(ab)(ab)
=a(ab)b(ab)
=a2abab+b2
=a22ab+b2
=a2+b22ab

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