Question 877325
Maybe you mean, find a root of {{{x^3-5x-6=0}}} ?


Use the expression on the left as {{{x^3-0*x^2-5x-6}}} and use Rational Roots Theorem to look for rational roots using synthetic division.  The possible roots to test would be 1, 2, 3, 6, -1, -2, -3, -6.


That work or its results not being shown unless you need it.  Much easier to just show the results of each root test than to include the actual synthetic divisions.