Прошу помогите!!!!!!!!

Question

Прошу помогите!!!!!!!!

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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