Question

упростите выражение:(3a-2)(3a+2)-(3a+1)^2

Answer 1

(3а-2)(3а+2)-(3а+1)^2=9а^2-4-(9а^2+6а+1)=6а-3.

Answer 2

(9a+6a-6a-4)-(3a+1)^2=9a-4-9a+6a+1=-4+6a+1=-3+6a