$\"\"$

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The function is $\"\"$ .

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$\"\"$ is a zero of h.

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The complex zeros occur in conjugate pairs, so, $\"\"$ is also a zero of h.

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Means that both $\"\"$ are the factors of h.

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Multiply these two factors : $\"\"$ . $\"\"$

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$\"\"$

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$\"\"$ (Using the formula : $\"\"$ )

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$\"\"$ (Using the formula : $\"\"$ )

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$\"\"$ (The imaginary unit : $\"\"$ )

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$\"\"$

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$\"\"$ $\"\"$

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Using long division, divide $\"\"$ by $\"\"$ .

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$\"\"$

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So, $\"\"$

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$\"\"$

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The zeros of h are $\"\"$ .

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$\"\"$

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All zeros of the function $\"\"$ are $\"\"$ .