s=3 t=82st^2 - s^2 = ?
2st^2-s^22x3x8^2-3^22x3x64-9=375
\(2st^2-s^2=~2(3)(8)^2-(3)^2~=~2(3)(64)-9\)\(=~6(64)-9~=~384-9~=~375\)375 is the answer
