Question 355830
{{{x^3 + 2x^2 + 3x + 6}}}
Notice that the coefficients 1, 2 & 3 add to 6, the last one.
Try x = 1 and -1 first.
Sub them, see if you get zero.
Since all the terms are positive, +1 won't work.  In fact, no + real numbers will work.
-------------
Try -1, then -2, etc.
------------
Once you find the first term, then it's 2nd order and simpler.