Originally Posted by
mathaddict $\displaystyle 5\times 5\times 5=5^3=125$ , therefore , $\displaystyle \sqrt[3]{125}=5$
so in your case now ,
$\displaystyle 3\times 3\times 3\times 3=3^4=81 $, therefore , $\displaystyle \sqrt[4]{81}=3$
Then proceed , $\displaystyle 2\times 3 =6$