Question

(3y+10)^2-(3y+10)y+y^2=14

Answer 1

(3y)^2+(10y)^2-3y^2-10y+y^2=14
9y^2+100y^2-3y^2-10y+y^2=14
(9y^2+100y^2-3y^2+y^2)-10y=14
107y^2-10y=14
Дальше не знаю