What is the rationalizing factor of $a^{2} + a b + b^{2}$ ?

{(a + b)}^{2}

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a + b

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a^{2} - b^{2}

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a - b

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Solution

The correct option is D $a - b$
We know after multiplying by rationalising factor we get rational number .
But , Here $a^{2} + a b + b^{2}$ , Seems to be rational itself , So there is no rationalising factor .

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