(8b-8)(8b+8)-8b(8b+8)при b=2
(8b-8)(8b+8)-8b(8b+8) = (8b+8)×(8b-8-8b) = (8b+8)×(-8) = -64b -64
-64b -64 при b=2
(-64*2)-64 = -192
ответ: -192
