The polynomial function is .

Observe the graph:

Here is an zeros of the realted polynomial function.

Binomial factor is .

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.

           (Factor form)

       (Simplify)

                  (Distributive property: )

Hence, .

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