Question

Rationalise the denominators of the following:
$\frac{1}{\sqrt{7}}$

Answer 1

We need to rationalise $\frac{1}{\sqrt{7}}$

Multiply numerator and denominator by $\sqrt{7}$, we get

$=\frac{1\left(\sqrt{7}\right)}{(\sqrt{7}\times \sqrt{7}}$

$=\frac{\sqrt{7}}{7}$