Question

what is meant by rationalising factor..???

Answer 1

Rationalising factor is a term with which a term is multiplied or divided to make the whole term rational.
example: rationalising factor of
$4 \sqrt{5 = \sqrt{5} }$
$4 \sqrt{5 \times \sqrt{5 = 4 \sqrt{5 \times 5} } }$
$4 \times 5 = 20$
hope it may help you

Answer 2

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What is rationalising factor?

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If the product of to surds is a rational number then each of them is called rationalizing factor of each other.

The Rationalizing factor is given by:-

$\leadsto \sf{ \sqrt[n]{a} = {a}^{n - \frac{1}{n} } }$