\[\boxed{\text{493}\text{\ (493)}\text{.}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[при\ a = - 8:\]
\[a^{2} = ( - 8)^{2} = 64.\]
\[a^{2} = 7^{2} = 49.\]
\[( - a)^{2} = \left( - ( - 8) \right)^{2} = 8^{2} = 64.\]
\[при\ a = 7:\]
\[( - a)^{2} = ( - 7)^{2} = 49.\]
\[|a|^{2} = a^{2} = ( - 8)^{2} = 64.\]
\[|a|^{2} = a^{2} = 7^{2} = 49.\ \]
\[Вывод:квадрат\ и\ модуль\ \]
\[числа\ есть\ числа\ \]
\[неотрицательные.\]
\[При\ любом\ значении\ a:\]
\[a^{2} = ( - a)^{2} = |a|^{2}\]