Question

Find rationalising factors of the denominators of $\frac{1}{\sqrt{8}}$

Answer 1

$\frac{1}{\sqrt{8}}$

Multiply numerator and denominator by $\sqrt{8}$ we get

$\frac{1\times \sqrt{8}}{\sqrt{8}\times \sqrt{8}}$

=$\frac{\sqrt{8}}{8}$