Practise the method.
Conjugate roots, real factors and remaining roots.
Example 1
Move an independent trial root and compare it with the given root. Its position is not checked or chosen for you.
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Answer:
Example 2
Explore the given roots one at a time. Compare their real and imaginary components before forming the coefficient.
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Example 3
Move an independent trial root and compare it with the given root. Its position is not checked or chosen for you.
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Answer: