$\"\"$

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The function is $\"\"$ , zero $\"\"$ .

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From the conjugate pair theorem, complex zeros occur in conjugate pairs.

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Thus conjugate of $\"\"$ is $\"\"$ .

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$\"\"$ .

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$\"\"$ is a one of factor of the function $\"\"$ .

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Find the other cubic factor by using long division.

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Factor the equation $\"\"$ by grouping.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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Remaining zeros are $\"\"$ .

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$\"\"$

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Remaining zeros are $\"\"$ .