9. x=±5i
11. x=−2±3i
13. {2, 3i,−3i}
15. 3−i
17. −5−i
19. −i,−3i
21. P(x)=2x4−20x3+70x2−180x+468
23. P(x)=7x5−119x4+777x3−2415x2+3500x−1750
25. P(x)=x(x+1)(x2+9)
27. P(x)=x(x−1)(x+2)(x2−6x+10)
29. 1, 4+i, 4−i
31. −43, 1+3i, 1−3i
33. 1 (with multiplicity 2), 32+32i, 32−32i
35. −3, 1, 3+i, 3−i
37. 12, 2, 3, i,−i
39. f(x)=13(x2+9)
41. f(x)=12(2−x)(x2+1)(x2+4)
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