Question

y³+2y²-9y-18=0
помогите пж

Answer 1

у³+2y²-9y-18=0
y²·(y+2)-9(y+2)=0
(y+2)·(y²-9)=0
y+2=0
y²-9=0
y=-2
y=3
y=-3
y1=-3, у2=-2,у3=3