Question

Write the rationalising factor of 1÷√7-√4

Answer 1

The rationalising factor of 1/(-,/7 - -,/4) is (-,/7 + -,/4).

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Answer 2

$\sqrt{7} + \sqrt{4}$

The rationalising factor of $\sqrt{7} - \sqrt{4}$ is $\sqrt{7} + \sqrt{4}$

as $(\sqrt{a} + \sqrt{b}) (\sqrt{a} -\sqrt{b} )=a-b$