Раскройте скобки: \( 3\cdot(5n+4m\,)^2=\)?\( n^{\,2}\) ?\( nm\) ?\( m^{\,2}\)

Задание

Раскройте скобки:

\(\displaystyle 3\cdot(5n+4m\,)^2=\)[?||-][ ]\(\displaystyle n^{\,2}\) [?|+|-][ ]\(\displaystyle nm\) [?|+|-][ ]\(\displaystyle m^{\,2}\)