Question

plz help it is very very difficult​

Answer 1

Solution

$= \frac{ \sqrt{5} + \sqrt{3} }{ \sqrt{5} - \sqrt{3} } + \frac{ \sqrt{5} - \sqrt{3} }{ \sqrt{5} + \sqrt{3} } \\ = \frac{( \sqrt{5} + \sqrt{3})( \sqrt{5} + \sqrt{3} ) + ( \sqrt{5} - \sqrt{3})( \sqrt{5} - \sqrt{3}) }{( \sqrt{5} + \sqrt{3})( \sqrt{5} - \sqrt{3} )} \\ = \frac{( \sqrt{5} + \sqrt{3} ) {}^{2} + ( \sqrt{5} - \sqrt{3} ) {}^{2} }{( \sqrt{5} ) {}^{2} - (\sqrt{3} ) {}^{2} } \\ = \frac{2( (\sqrt{5} ) {}^{2} + ( \sqrt{2} ) {}^{2} )}{5 -3} \\ = \frac{2(5 + 3)}{2} \\ = 8$

answer is 8

formula used here....

(a+b)²+(a-b)²=2(a²+b²)

(a+b)(a-b)=a²-b²

Answer 2

Answer:

It is very easy just rationlise it. Give a difficult question then i will answer it.

Step-by-step explanation:

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