$\"\"$

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The zeroes of the polynomial function are $\"\"$ .

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If $\"\"$ is a zero, then $\"\"$ is also a zero.

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According to the complex conjugate theorem,

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Therefore, $\"\"$ are factors of the polynomial function.

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The polynomial function as a product of its factors is $\"\"$ .

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Solve the equation.

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$\"\"$ (write the equation)

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$\"\"$ (Regroup terms)

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$\"\"$ (Difference of squares)

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Foil method)

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$\"\"$ (Simplify)

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$\"\"$ (Combine like terms)

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$\"\"$ (Distributive property: $\"\"$ )

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$\"\"$ (Simplify)

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$\"\"$ (Combine like terms)

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Therefore the polynomial function is $\"\"$ .

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$\"\"$

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The polynomial function is $\"\"$ .