if the problem is x3 = 95 your calculator tells you that one solution is 4.5629
Then you can divide x - 4.5629 into x3 - 95 to get x2 + 4.5629x + 20.82 using the quadratic equation, you get -2.28145 +- 3.95158i (2 complex roots)
If you are trying to get the real root without a calculator, you could, you could use Newton's Iterative method to find it (If you are in a Calculus class?)
It is unclear exactly how you would want to go about getting the roots.... whether you want all 3 or just the real root?