Exercises 15.2, page 430

(Note: Unknown roots listed)

  1. 1.  − 1 ,   − 1 ,  1 ,  1 ,  1

  2. 3.  − 3 ,   − 2 ,  2

  3. 5. 5 ,  3j ,   − 3j

  4. 7.  − 1 ,  4

  5. 9.  − 2 ,   − 2

  6. 11.  − j ,  25

  7. 13. 3 ,  2 − j

  8. 15.  − 1 ,  12

  9. 17.  − 2 ,  1

  10. 19. 1 − j ,   − 2 ,  12

  11. 21. j ,   − j

  12. 23.  − j ,   − 1 ,  1

  13. 25.  − 2j ,   − 3 ,  3

  14. 27. If j is a root,  − j must also be a root, and  − j is not one of the roots.

  15. 29.  − 7

  16. 31.  − 1 ,  12 (1 ± 13)

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