Question

Разложите на множители многочлен: (y-3)(y^2+3y+9)-y(y-3)(y+3)-(y+3)^2=(y-3)(y^2+3∙y+3^2 )- -y(y^2-9)-(y^2+2∙y∙3+3^2 )=y^3-3^3-y^3+9y-y^2-6y-9= =((-27))+9y-y^2-(6y ) ((-9))=-y^2+3y-36