#### Answer

$$ \sqrt[4]{12}z^3x^{.5}y^{2/3} $$

#### Work Step by Step

In order to solve this problem, we must use the rules of radicals, which are listed on page 421. Doing this, we find that the expression simplifies to:
$$\sqrt[4]{12}\sqrt[4]{z^{12}}\sqrt[4]{x^2y^6} \\ \sqrt[4]{12}z^3\sqrt[4]{x^2y^6} \\ \sqrt[4]{12}z^3x^{.5}y^{2/3} $$