$\"\"$

The polynomial function is $\"\"$ and zero is $\"\"$ .

The root of the function is $\"\"$ .

The conjugate pair theorem, complex zeros occur in conjugate pairs.

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

$\"\"$ .

By factor theorem, $\"\"$ is a factor of $\"\"$ .

Consider $\"\"$ .

Factor $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, the remaining zeros of the function $\"\"$ are $\"\"$ and $\"\"$ .

$\"\"$

The remaining zeros of the function $\"\"$ are $\"\"$ and $\"\"$ .