Question

прошу помогите!!!!!!!!

Answer 1

y^3+3y^2-9y-27=0
y^2*(y+3)-9(y+3)=0
(y+3)*(y^2-9)=0
y+3=0
y^2-9=0
y=-3
y=3
y=-3
 или y1=-3; y2=3