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I have seen this problem in Algebra textbook by Fraleigh.

But I couldn't find any explanation.

Can you give me a hint?

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    $\begingroup$ It is a splitting field. $\endgroup$
    – Eric Wofsey
    Dec 6, 2022 at 2:16
  • $\begingroup$ Oh... I think the solution is wrong... thank you $\endgroup$
    – SGKw
    Dec 6, 2022 at 2:35

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