1)(b+8)*(b-8-(b+8))=-16(b+8)=-16b-128
2)4m^2-20m+25-4m^2+4*49=221-20m
a) (b^2-8b+8b-64)-(b^2+16b+64)=b^2-8b+8b-64-b^2-16b-64=-16b-128
б) 4m^2-20m+25-4(m^2+7m-7m-49)=4m^2-20m-4m^2+196=-20m+221
