Question 1112643
Try Rational Roots Theorem, and look for all the possible rational roots and find any that fit, using if possible, synthetic division or polynomial division.  You will only find ONE rational root.  The only rational root is 1.  The other possible roots to check will not be found as roots.


Next, you will just have a quadratic factor to find zeros, and you already know about general solution for a quadratic equation to find these roots. These two roots are complex.