Раскройте скобки: \( 7\cdot(3x+2y\,)^2=\)?\( x^{\,2}\) ?\( xy\) ?\( y^{\,2}\)

Задание

Раскройте скобки:

\(\displaystyle 7\cdot(3x+2y\,)^2=\)[?||-][ ]\(\displaystyle x^{\,2}\) [?|+|-][ ]\(\displaystyle xy\) [?|+|-][ ]\(\displaystyle y^{\,2}\)