Question

Rationalise the colenominator 4
4-N5​

Answer 1

Answer:

$\frac{4}{4 - \sqrt{5} } \times ( \frac{4 + \sqrt{5} }{4 + \sqrt{5} } ) \\ \frac{4(4 + \sqrt{5)} }{ {(4)}^{2} - {( \sqrt{5} )}^{2} } \\ \frac{4(4 + \sqrt{5)} }{16 - 5} \\ \frac{16 + 4 \sqrt{5} }{11}$

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