The polynomial is ;.

The binomial is a factor of polynomial.

Here is a zero of the realted polynomial function.

Use synthetic division to find remaining factor of the polynomial.

Since the remainder is zero, is a factor of polynomial.

The polynomial can be factored as .

The polynomial is the depressed polynomial.

Hence, .

Check:

Multiply the factors and check whether it is intial polynomial or not.

                        (Factors)

                 (Group the factors)

                                (Foil method)

                      (Multiply)

Apply distributive property: .

                                   (Simplify)

.