Question

Rationalise the denomintor 1/√5+√7​

Answer 1

Answer:

(√5 - √7) / 12

Step-by-step explanation:

(a + b)(a - b) = a² - b²

$\frac{1}{\sqrt{5} +\sqrt{7} }$ = $\frac{\sqrt{5} -\sqrt{7} }{(\sqrt{5} +\sqrt{7}) ( \sqrt{5} -\sqrt{7})}$ = $\frac{\sqrt{5} -\sqrt{7} }{12}$