a) (12m-1)(3m+2)-(6m+1)^2=36 m^2 +24m-3m-2-36 m^2-12m-1=9m-3=3(3m-1)
б) (4a+3)^2+(3a+2)(4a+1)=16 а^2+24a+9+12 a^2+3a+8a+2=28 a^2+35a+11
a) (12m-1)(3m+2)-(6m+1)^2=36m^2+21m-2-(36m^2+12m+1)=36m^2+21m-2-36m^2-12m-1=9m-3
б) (4a+3)^2+(3a+2)(4a+1)=16а^2+24а+9+12а^2+3а+8а+2=28а^2+35а+11
