Раскройте скобки: \( -7\cdot(a+t\,)^2=\)?\( a^{\,2}\) ?\( at\) ?\( t^{\,2}\)

Задание

Раскройте скобки:

\(\displaystyle -7\cdot(a+t\,)^2=\)[?||-][ ]\(\displaystyle a^{\,2}\) [?|+|-][ ]\(\displaystyle at\) [?|+|-][ ]\(\displaystyle t^{\,2}\)