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Question

What should be added to a2+2ab to make it a complete square?

A
b2
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B
2ab
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C
ab
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D
2a
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Solution

The correct option is B b2
As we know from the formula
(x+y)2=x2+2xy+y2
similarly we need to add b2 to get whole square, Hence (a+b)2=a2+2ab+b2

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