The polynomial $$p(x)= x^5 - x^4 - 13x^3 + 13x^2 + 36x - 36$$ has five real roots. One of them is $x=1$. List the other four in increasing sequence:
, , , and .
Hint: Divide by $(x-1)$ and solve the resulting quartic equation which is almost like a quadratic equation.