(5+2y)*(у-3)-(5-2y)2 =

Question

(5+2y)*(у-3)-(5-2y)2 =

Answer 1

5у + 2у*2 -15 -6y - 10 +4y = 2y^2 +3y -25

Answer 2

Умножаем-
5у+2у^2-15-6у-(10-4у)=
2у^2-15-у-10+4у=
3у-25+2у^2