Question

упростите выражение (y-1) (y+2)-(y+2)^2

Answer 1

y²-y+2y-2-y²-4y-4=-3y-6

Answer 2

(y-1) (y+2)-(y+2)²=у²+2у-у-2-(у²+4у+4)=у²+у-2-у²-4у-4=-3у-6=-3(у+2)