(3y-5)*2y-(y-3)(y-7) упростите выражение

Question

(3y-5)*2y-(y-3)(y-7) упростите выражение

Answer 1

=6y^2-10y-y^2+7y+3y-21 = 5y^2-21

Answer 2

6y^2-10y-y^2+3y+7y-21=5y^2-21