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What is the rationalising factor for 1/under root 7 - under root 3and hoe to simplify it further?

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no actually the question is a bit different there is only one '1' in the numerator and under root 7 and under root 3 in the denominator
1/√7-√3 do you mean this?


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Rationalizing Factor is 


You need to multiply the number by this and you will rationalize the number. We can have infinite rationalizing factors. There are other factors also.
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