You can put this solution on YOUR website! The equation has integer coefficients, so any root must be a factor of the coefficient of the highest term (x^3) and a factor of the lowest term (-1) in the ratio -1/1. So we expect 1 to be a zero of the polynomial. so (x-1) evenly divides the original polynomial.
The quadratic can be solved using the quadratic formula, with results of
So, the roots are , , and
(