Simplifying a dividing surd? Can anyone explain how I would simplify this dividing surd: $$\frac{3\sqrt{14}}{\sqrt{42}}$$ As far as I can see $\sqrt{14}$ and $\sqrt{42}$ can't be simplified, right? So how does the division and the multiplication of 3 come into it? Thanks for the help!

$$\frac{3\sqrt{14}}{\sqrt{42}}=\frac{3\sqrt{14}}{\sqrt{3}\sqrt{14}}=\frac{3}{\sqrt{3}}=\sqrt{3}$$