Radical simplify the expression, and eliminate any negative exponents(s). Assume that all letters denote positive numbers.

a)$\sqrt{6}\left\{{y}^{5}\right\}\sqrt{3}\left\{{y}^{2}\right\}$

b)$\left(5\sqrt{3}\left\{x\right\}\right)\left(2\sqrt{4}\left\{x\right\}\right)$

a)

b)