Simplify the following completely:

A) 40x28x9\displaystyle \sqrt{{{40}{x}^{{2}}}}\cdot\sqrt{{{8}{x}^{{9}}}}

Answer: 40x28x9=AB\displaystyle \sqrt{{{40}{x}^{{2}}}}\cdot\sqrt{{{8}{x}^{{9}}}}={A}\sqrt{{{B}}}, where
A=\displaystyle {A}= and
B=\displaystyle {B}=

Preview A\displaystyle {A}:  
Preview B\displaystyle {B}:  



B) 30x210x6\displaystyle \sqrt{{{30}{x}^{{2}}}}\cdot\sqrt{{{10}{x}^{{6}}}}

Answer: 30x210x6=AB\displaystyle \sqrt{{{30}{x}^{{2}}}}\cdot\sqrt{{{10}{x}^{{6}}}}={A}\sqrt{{{B}}}, where
A=\displaystyle {A}= and
B=\displaystyle {B}=

Preview A\displaystyle {A}:  
Preview B\displaystyle {B}: