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Question

What term should be substracted to a2+2ab to make it a perfect square?


A

b

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B

+4abb2

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C

4ab+b2

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D

2ab

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Solution

The correct option is B

+4abb2


To make (a2+2ab) a perfect square, +4abb2 is to be added.
So that (a2+2ab+b2) will be come a perfect square using the identity (ab)2=(a22ab+b2).


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