Answer
$\sqrt[4]{18x^3}$
Work Step by Step
RECALL:
For nonegative numbers a and b,
$\sqrt[n]{a} \cdot \sqrt[n]{b} = \sqrt[n]{ab}$
Also,
$x^{a}+x^{b}=x^{a+b}$
Use the rules above to obtain:
$=\sqrt[4]{6x^2\cdot 3x}
\\=\sqrt[4]{18x^{2+1}}
\\=\sqrt[4]{18x^3}$
