# How do you simplify sqrt(3)*sqrt(7)*sqrt2?

$\sqrt{\textcolor{red}{a}} \cdot \sqrt{\textcolor{b l u e}{b}} = \sqrt{\textcolor{red}{a} \cdot \textcolor{b l u e}{b}}$
$\sqrt{\textcolor{red}{3}} \cdot \sqrt{\textcolor{b l u e}{7}} \cdot \sqrt{\textcolor{g r e e n}{2}} \implies \sqrt{\textcolor{red}{3} \cdot \textcolor{b l u e}{7} \cdot \textcolor{g r e e n}{2}} \implies \sqrt{42}$