X^3-3X^2-5X-1=0

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X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0X^3-3X^2-5X-1=0(X+1)(X^2-4X-1)=0X+1=0或X^2-4X-1X=-1或X=2+

X^3-3X^2-5X-1=0
X^3-3X^2-5X-1=0

X^3-3X^2-5X-1=0
X^3-3X^2-5X-1=0
(X+1)(X^2-4X-1)=0
X+1=0 或 X^2-4X-1
X=-1 或 X=2+根号5 或 X=2-根号5