The polynomial function is .

Step 1: Find the total number of zeros.

Since the polynomial function has degree , the function has zeros.

Step 2: Find the type of zeros.

Examine the number of sign changes for and .

The possible number of positive zeros of polynomial function is the number of sign changes of the coefficients of or that number positive odd number.

.

Since there are sign changes in the the possible number of positive zeros of polynomial function is .

.

Since there are sign changes in the the impossible number of negative zeros of polynomial function is .

Hence, by Descartes sign rule, the maximum number of zeros is .

Step 3: Find the real zeros list some possible values and then use synthetic substitution to evaluate for real values of .

 The depressed polynomial is .

The depressed polynomial is .

The quadratic function is .

                     (Quadratic formula)

   (Substitute and )

                          (Simplify)

                                 (Subtract and simplify)

and            (Separate two roots)

and                      (Simplify)

The function has two real zeros at and , imaginary zeros at and .

Check solution for -values.

Graph:

Graph the equation .

Observe the graph:

The graph cross the - axis at and .

Therefore, the value of is and .

The function has number of real and imaginary zeros.

Zeroes of the function are and and and .