Упростить выражение (12m-1)(3m+2)-(6m+1)^2

(12m-1)(3m+2)-(6m+1)^2= =36m^2-3m+24m- 2-36m^2--12m-1=9m-3=3(3m-1)

(12m-1)(3m+2)-(6m+1)^2 = 36m^2+24m-3m-2 - 36m^2 +12m+1=33m-1