Question

what will be the answer, please explain​

Answer 1

Answer:

B) 16/5

It is the correct answer

Answer 2

$\huge \underline \mathbb{HELLO}$

$( \sqrt{5} - \frac{1}{ \sqrt{5} } ) {}^{2} \\ = (\sqrt{5} ) {}^{2} - 2( \sqrt{5})( \frac{1}{ \sqrt{5} } ) + (\frac{1}{ \sqrt{5} } ) {}^{2} \\ = 5 \: - 2 + \frac{1}{5} \\ = 3 \: + \frac{1}{5} \\ = \frac{15 + 1}{5} \\ = \frac{16}{5}$

Thus, option( b ) is correct.

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using identity (a-b)² =a²-2ab+b²

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HOPE IT HELPS!!!

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