3(m+2b)^2-12mb=3(m^2+2n2b+2b^2)-12mb=3(m^2+4mb+4b)-12mb=3m^2+12mb+4b-12mb=3m^2+4b 2(3m-1)-a^3=6m-2-a^3 2(3m-1) ^2+12m=2(3m^2-2*3m*1+1^2)+12m=2(9m^2-6m+1)+12m=18m^2-12m+2+12m=18m^2+2