Question

Hey friends plzz answer it fast ...!!!
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Question 2====vii

Answer 1

Hey!!!

Good Evening

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Let's rationalise this

We have

$\frac{4}{ \sqrt{11} - \sqrt{7} }$

Now multiply and divide (√11 + √7)

We will have

$= > \frac{4( \sqrt{11} + \sqrt{7}) }{( \sqrt{11} - \sqrt{7})( \sqrt{11} + \sqrt{7} ) }$

Using the identity of a² - b² in denominator

$= > \frac{4( \sqrt{11} + \sqrt{7} ) }{ {11} - {7} }$

$= > \frac{4 ( \sqrt{11} + \sqrt{7} )}{4}$

Cancelling 4

=> √11 + √7 <<<<<< Answer

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Hope this helps ✌️

Good Night

Answer 2

4 / √11 - √7

=> 4 ( √11 + √7 ) / ( √11 - √7 )( 11 + √7)

=> 4 ( √11 + √7 ) / 11 - 7

=> 4 ( √11 + √7 ) / 4

=> √11 + √7