Question

Simplify the radical expression by rationalizing the denominator. $\frac{2}{ \sqrt{42} }$

Answer 1

$\bf \cfrac{2}{\sqrt{42}}\cdot \cfrac{\sqrt{42}}{\sqrt{42}}\implies \cfrac{2\sqrt{42}}{(\sqrt{42})^2}\implies \cfrac{2\sqrt{42}}{42}\implies \cfrac{\sqrt{42}}{21}$