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Which number is to be added to make perfect square

9a^2+2ab+b^2

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 In order to make 9 a^2+2 a b+b^2 a perfect square, the middle term should be 6ab. At present it is 2ab, so we need to add 4ab to it.

9 a^2+6 a b+b^2=(3 a+b)^2

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Divya Sharma

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