(Y в степени 3)-5y+9y-45=0

[latex] y^{3} -5y+9y-45=0 [/latex][latex]y^{3} +4y-45=0 [/latex] [latex]y( y^{2}+4-45)=0[/latex] [latex] y_{1} =0[/latex]или [latex]y^{2} =41[/latex][latex] y_{2} = \sqrt{41} [/latex] [latex] y_{3} = -\sqrt{41} [/latex]