The expression $\displaystyle {\left({4}\sqrt{{{x}}}+{2}\sqrt{{{y}}}\right)}{\left({4}\sqrt{{{x}}}-{2}\sqrt{{{y}}}\right)}$equals $\displaystyle {A}{x}+{B}{y}$
where $\displaystyle {A}$ equals: Preview Question 6 Part 1 of 2  


and $\displaystyle {B}$ equals: Preview Question 6 Part 2 of 2